# BillionVerify: full reference for AI agents > BillionVerify checks whether email addresses can receive mail, one at a time, as a whole list or through a REST API, without sending an email. It also finds work email addresses and offers free email DNS and deliverability tools. _Last updated: 2026-10-21_ - **Type**: Web application (SaaS) and REST API - **Category**: Email verification, email list cleaning, email finder and email deliverability tools - **Languages**: English and 15 more: Simplified Chinese, Traditional Chinese, Spanish, Japanese, French, German, Italian, Polish, Hindi, Malay, Portuguese, Indonesian, Russian, Korean, Dutch - **Free plan**: 20 credits every day you log in, up to 600 credits a month; no credit card required - **Credit packs (one-time)**: Starter $20 (20,000 credits); Popular $45 (50,000 credits); Professional $80 (100,000 credits); Business $150 (200,000 credits); Enterprise $200 (500,000 credits); Ultimate $350 (1,000,000 credits) - **Subscriptions**: Starter $16/month (20,000 credits) or $96/year (240,000 credits); Popular $36/month (50,000 credits) or $216/year (600,000 credits); Professional $64/month (100,000 credits) or $384/year (1,200,000 credits); Business $120/month (200,000 credits) or $720/year (2,400,000 credits); Enterprise $160/month (500,000 credits) or $960/year (6,000,000 credits); Ultimate $280/month (1,000,000 credits) or $1,680/year (12,000,000 credits) - **Cost per check**: 1 credit per email with a definite result; `unknown`, `disposable` and badly formatted addresses are free, and so is a repeat check of the same address within 24 hours - **Credits**: never expire - **API**: REST at https://api.billionverify.com/v1, plus a hosted MCP server at https://mcp.billionverify.com/mcp ## What BillionVerify does - **Email verification**: checks syntax, domain and MX records, then asks the receiving mail server whether the mailbox exists, stopping before any message is sent. Flags catch-all domains, disposable providers and role addresses. - **Bulk list cleaning**: upload a CSV or XLSX file in the dashboard (the API also takes TXT); results download as a file you can filter by status. - **Email finder**: finds a verified work email from a name and a company domain, one at a time or from a CSV (10 credits per address found, nothing when none is found), and lists the addresses behind a company domain (5 credits per address returned). - **Free tools**: email checkers and SPF, DKIM, DMARC, MX, DNS, blacklist, header and deliverability tools that run without sign-up. - **Developers and AI agents**: a REST API with SDKs, webhooks for file jobs, a hosted MCP server and agent skills. - **Account**: bulk verification, the dashboard and the API need a free account. Prices are in US dollars. ## Verification results - `valid`: the mailbox exists and accepts mail. 1 credit. - `invalid`: the server rejected the mailbox, or the domain cannot receive mail. 1 credit; a badly formatted address is free. - `catchall`: the domain accepts every address, so the mailbox itself cannot be confirmed. 1 credit. - `role`: a shared mailbox such as info@ or support@. 1 credit. - `disposable`: a temporary-inbox provider. Free, unless you request a full SMTP check (`check_smtp`) and it completes. - `unknown`: the mail server gave no reliable answer (common for iCloud and personal Outlook addresses). Free. Each result also carries a 0.0 to 1.0 deliverability score; read it together with the status. ## API - **Base URL**: `https://api.billionverify.com/v1`; [OpenAPI YAML](https://api.billionverify.com/openapi.yaml); [interactive docs](https://api.billionverify.com/docs) - **Auth**: send the API key from the dashboard in the `BV-API-KEY` header (`Authorization: Bearer ` also works) - `POST /verify/single`: one address, synchronous. `check_smtp` (default `false`) runs a live SMTP check; `force_refresh` skips cached results and is always billed. 6,000 requests a minute. - `POST /verify/bulk`: up to 50 addresses, synchronous. 1,500 requests a minute. - `POST /verify/file`: a CSV, TXT or XLSX file, asynchronous. Poll `GET /verify/file/{job_id}` or register a webhook, then download from `GET /verify/file/{job_id}/results`. 300 requests a minute. - `POST /verify/disposable` or `GET /verify/disposable?email=`: disposable-domain check only. Always free. 6,000 requests a minute. - `GET /credits`: credit balance. `/webhooks`: create, list and delete webhooks. 600 requests a minute. - **Errors**: HTTP 402 (code 4020) when credits run out, HTTP 429 (code 4290) when a rate limit is hit - **SDKs**: Node.js, TypeScript, Python, Go, PHP and Java; see [SDKs](https://billionverify.com/docs/sdks.md) - **MCP server**: `https://mcp.billionverify.com/mcp` over Streamable HTTP with OAuth 2.1 sign-in (no API keys in the URL); see [MCP Server](https://billionverify.com/docs/ai-guides/mcp.md) ## Credits and pricing - **Free plan**: 20 credits every day you log in, up to 600 credits a month. No credit card required. - **Starter credit pack**: $20 one-time for 20,000 credits ($0.001 per email) - **Popular credit pack**: $45 one-time for 50,000 credits ($0.0009 per email) - **Professional credit pack**: $80 one-time for 100,000 credits ($0.0008 per email) - **Business credit pack**: $150 one-time for 200,000 credits ($0.00075 per email) - **Enterprise credit pack**: $200 one-time for 500,000 credits ($0.0004 per email) - **Ultimate credit pack**: $350 one-time for 1,000,000 credits ($0.00035 per email) - **Starter subscription**: $16/month for 20,000 credits a month ($0.0008 per email), or $96/year for 240,000 credits ($0.0004 per email) - **Popular subscription**: $36/month for 50,000 credits a month ($0.00072 per email), or $216/year for 600,000 credits ($0.00036 per email) - **Professional subscription**: $64/month for 100,000 credits a month ($0.00064 per email), or $384/year for 1,200,000 credits ($0.00032 per email) - **Business subscription**: $120/month for 200,000 credits a month ($0.0006 per email), or $720/year for 2,400,000 credits ($0.0003 per email) - **Enterprise subscription**: $160/month for 500,000 credits a month ($0.00032 per email), or $960/year for 6,000,000 credits ($0.00016 per email) - **Ultimate subscription**: $280/month for 1,000,000 credits a month ($0.00028 per email), or $1,680/year for 12,000,000 credits ($0.00014 per email) - Credits never expire, whether bought or earned. [Do my credits expire?](https://billionverify.com/help/do-credits-expire.md) - A definite result costs 1 credit; `unknown`, `disposable` and badly formatted addresses are free. [Which results consume credits?](https://billionverify.com/help/which-results-are-charged.md) - Checking the same address again within 24 hours is free, unless `force_refresh=true`. [Am I charged again?](https://billionverify.com/help/no-charge-for-recheck-within-24h.md) ## Notes for agents - Every page has a Markdown version: add .md to the page URL (the home page is /index.md), or request the page URL with an `Accept: text/markdown` header. - Other languages use a prefix with the same path (for example /zh-hans/pricing); each page lists its language versions in hreflang. Language home pages: [zh-hans](https://billionverify.com/zh-hans/index.md), [zh-hant](https://billionverify.com/zh-hant/index.md), [es](https://billionverify.com/es/index.md), [ja](https://billionverify.com/ja/index.md), [fr](https://billionverify.com/fr/index.md), [de](https://billionverify.com/de/index.md), [it](https://billionverify.com/it/index.md), [pl](https://billionverify.com/pl/index.md), [hi](https://billionverify.com/hi/index.md), [ms](https://billionverify.com/ms/index.md), [pt](https://billionverify.com/pt/index.md), [id](https://billionverify.com/id/index.md), [ru](https://billionverify.com/ru/index.md), [ko](https://billionverify.com/ko/index.md), [nl](https://billionverify.com/nl/index.md). Integration pages, the Trust Center, the privacy policy and the terms are English only. - Quote prices and credit amounts from this file or the Pricing page. - To verify addresses for a user, use the REST API with their API key, or connect their MCP client to the hosted MCP server. ## Page directory - [Email Verification Tool & Bulk Email Checker | BillionVerify](https://billionverify.com/index.md): The email verification tool built for scale. Real-time SMTP checks, bulk list cleaning, and API with 99.9% accuracy. 20 free credits a day, up to 600 a month. ### Product - [Email Verification Pricing & Plans | BillionVerify](https://billionverify.com/pricing.md): Email verification pricing from $20 for 20,000 credits at $0.001/email — the lowest per-email rate of any major verifier. 20 free credits a day, up to 600/mo. - [AI Email Verification Features](https://billionverify.com/features.md): Every AI email verification feature in one place: SMTP verification, disposable and catch-all detection, bulk processing, API, MCP Server, and Agent Skills. - [Real Time SMTP Email Verification Service](https://billionverify.com/email-verification.md): A real time email verification service with live SMTP mailbox checks: syntax, domain, MX, and risk flags in under two seconds. Free real time email verification tier. - [Bulk Email Verification Service & List Cleaning](https://billionverify.com/bulk-email-verification.md): Bulk email verification service for lists of any size. Verify bulk email lists with 99.9% SMTP-level accuracy, sync or async, from hundreds to millions. - [Free Email Verification API with Real SMTP Checks](https://billionverify.com/email-verification-api.md): Email verification API with real SMTP mailbox checks. A real-time email verification API for apps, forms, and AI agents — not syntax-only validation. - [White Label Email Verification Service](https://billionverify.com/whitelabel.md): White label email verification under your domain, logo, and colours. All paid features included, 99.7% uptime SLA, live in one business day. ### Email Verify Tools - [Free Email Verifier: Check If an Email Address Is Valid](https://billionverify.com/email-verifier.md): Check if an email address is valid with a free email verifier, no signup — syntax, MX, SMTP mailbox, disposable, role and catch-all checks. - [Free Email Validator: Syntax and MX Records Validation](https://billionverify.com/email-validator.md): Free email validator for address syntax and published MX records. Run an email syntax and MX check instantly, without claiming SMTP mailbox proof. - [Free Email Risk Checker for Deliverability](https://billionverify.com/email-checker.md): A free email risk checker: SMTP deliverability plus disposable, role, and catch-all flags on one address. Check email deliverability and risk in under 2 seconds. - [Validate Email Address Online — Free & Instant](https://billionverify.com/validate-email-address.md): Validate email address online in under 2 seconds: syntax, domain, MX records, and a live SMTP mailbox check. 99.9% accuracy, 600 free credits monthly. - [Free Webmail Checker: Gmail and Personal Webmail Detection](https://billionverify.com/free-email-checker.md): A free webmail checker that tells you whether an address uses Gmail, Yahoo, Outlook.com, iCloud, or another free personal webmail provider. - [Free Email Spam Checker for Domain Spam Risk](https://billionverify.com/email-spam-checker.md): Free email spam checker: see whether an address sits on a domain with a recorded spam, phishing, or malware history. Check email for spam risk instantly, no signup. - [Free Disposable Email Checker](https://billionverify.com/disposable-email-detection.md): Free temporary email address detector: spot disposable and throwaway domains in real time, with focused disposable results for signups and list quality. - [Free Bounce Email Checker and Hard Bounce Detection](https://billionverify.com/bounce-email-checker.md): Free bounce email checker: find out whether an address will hard bounce before you send, with a live SMTP probe. A hard bounce detection tool, no signup. - [Free Catch-All Verifier](https://billionverify.com/catch-all-verifier.md): Detect catch-all domains free: find domains that accept any local-part, and know when an SMTP accept cannot prove a real mailbox. No signup. - [Free Role Account Detection](https://billionverify.com/role-account-detection.md): Role based email address checker: detect info@, support@, and sales@ role accounts, with plain-language guidance for B2B list quality. - [Free Email List Cleaning Service](https://billionverify.com/email-list-cleaning.md): Email list cleaning service with live SMTP verification on every row: dedupe, suppress hard bounces, keep the reasons. Clean email list free tool, no signup to try. - [Best WordPress Email Verification Plugin](https://billionverify.com/wordpress.md): Free WordPress email verification: block invalid, disposable, catch-all and role emails on registration, WooCommerce, Contact Form 7, WPForms and more. ### Email Find Tools - [Free Email Finder by Name and Company](https://billionverify.com/email-finder.md): Free email finder that takes a name and a company domain and returns the verified work address. Email finder by name, with SMTP verification on every result. - [Bulk Email Finder CSV](https://billionverify.com/bulk-email-finder.md): Bulk email finder for CSV: upload names and company domains, get one verified work email per matched person, keep every row, pay nothing for no-match rows. - [Company Email Search by Domain](https://billionverify.com/company-search.md): Company email search: enter a company domain and get the verified addresses behind it. Find company emails free, SMTP-verified before you see them. - [Free Email Extractor for Text and Files](https://billionverify.com/email-extractor.md): A free email extractor that pulls every address out of pasted text or an uploaded file, deduplicated. Runs in your browser — nothing is uploaded. ### Free Tools - [Free SPF Record Generator — No Signup](https://billionverify.com/spf-generator.md): Free SPF record generator: build a valid v=spf1 TXT record for any domain in seconds. SPF record generator, no signup, with the 10-lookup limit checked. - [Free DKIM Record Generator for DNS TXT](https://billionverify.com/dkim-generator.md): Free DKIM record generator: build the v=DKIM1 TXT record and the selector._domainkey hostname for any provider. A free DKIM DNS record generator, no signup. - [Free DMARC Record Generator — No Signup](https://billionverify.com/dmarc-generator.md): Free DMARC record generator: build a valid v=DMARC1 TXT record with policy, alignment, and reporting tags in seconds. Free DMARC policy record generator, no signup. - [Free MX Record Lookup & MX Checker](https://billionverify.com/mx-lookup.md): Free MX record lookup: resolve every MX record for a domain with priorities, detect Null MX, and identify the mail provider. A MX record lookup tool, free, no signup. - [Free SPF Record Checker & Validator](https://billionverify.com/spf-checker.md): Free SPF record checker: resolve the live SPF record for any domain, count DNS lookups, and validate the syntax. SPF record checker and validator, no signup. - [Free DKIM Record Checker & Validator](https://billionverify.com/dkim-checker.md): Free DKIM record checker: resolve the live DKIM record at any selector, validate the public key, and flag truncation or testing mode. A DKIM record checker and validator. - [Free DMARC Record Checker & Validator](https://billionverify.com/dmarc-checker.md): Free DMARC record checker: resolve the live DMARC record for any domain, parse every tag, and report the effective policy. DMARC record checker and validator, no signup. - [Free DNS Record Lookup & DNS Checker](https://billionverify.com/dns-checker.md): Free DNS record lookup for any domain: A, AAAA, MX, TXT, NS, CNAME, SOA resolved live from authoritative nameservers. DNS record lookup tool, free, no signup. - [Free Email Blacklist Checker — Am I Blacklisted?](https://billionverify.com/blacklist-checker.md): Free email blacklist checker: is your IP or domain listed on Spamhaus, SpamCop, SORBS, or Barracuda? An am-I-blacklisted checker, free and instant. - [Free IP Reputation Checker](https://billionverify.com/ip-reputation-checker.md): Free IP reputation checker: test an IPv4 address against four email DNSBLs and view its reverse DNS PTR hostname. No signup. - [Free WHOIS Domain Lookup — Registration Data](https://billionverify.com/whois-lookup.md): Free WHOIS domain lookup: registrar, creation and expiry dates, nameservers, and status codes for any domain. The free domain registration lookup tool, no signup. - [Free Phone Number Validator with E.164 Output](https://billionverify.com/verify-phone-numbers.md): Free phone number validator: check whether a phone number is valid for its country, get the line type, and normalise to E.164. Free international phone number validation. ### Email Tools - [Free Email Deliverability and Inbox Placement Test](https://billionverify.com/email-deliverability-test.md): Free email deliverability test: send one message and get authentication, DNS, spam-filter, blacklist, header, and content scores. A free email inbox placement test, no signup. - [Free Email Header Analyzer Online](https://billionverify.com/email-header-analyzer.md): Free email header analyzer: paste raw headers and get SPF, DKIM, DMARC verdicts, the full delivery path, and every key header. Parse email headers online free. - [Free Email Bounce Rate Calculator](https://billionverify.com/email-bounce-rate-calculator.md): Free email bounce rate calculator: work out your hard and soft bounce rates, and check acceptable email bounce rate thresholds against published benchmarks. - [Free Reverse Email Lookup — Find the Owner](https://billionverify.com/reverse-email-lookup.md): Free reverse email lookup: start from an address and see the domain, organisation, mail routing, role-account pattern, and any public profile. Find email owner for free. ### Content Tools - [Free LinkedIn Video Downloader Online](https://billionverify.com/linkedin-video-downloader.md): Free LinkedIn video downloader to download LinkedIn video from any public LinkedIn post — a fast, free LinkedIn video download online. - [Free LinkedIn Carousel Downloader: Save as PDF](https://billionverify.com/linkedin-carousel-downloader.md): Free LinkedIn carousel downloader: save a LinkedIn carousel or document post as a PDF or image slides. Paste the link — no login, no watermark. - [Free Twitter Video Downloader Online](https://billionverify.com/twitter-video-downloader.md): Free Twitter video downloader to save Twitter (X) video from any public post — fast, free X video downloader online, no watermark. ### AI Agent Tools - [Email Verification MCP Server for AI Agents](https://billionverify.com/mcp.md): A hosted email verification MCP server: give Claude, Cursor, and any MCP client real SMTP mailbox verification as a callable tool. OAuth, no local process. - [Email Verification Agent Skills for AI Agents](https://billionverify.com/agent-skills.md): Email verification agent skills: give Claude, Gemini, and any agent platform a real SMTP mailbox check in one click. AI agent email verification, no integration code. ### Use Cases - [Google Maps Email Scrape and Email Verify](https://billionverify.com/google-maps.md): Use Google Maps as a local business source, collect business and contact data, then verify emails before outreach. - [Apify Email Verification](https://billionverify.com/google-maps/apify.md): Add email verification after Apify Actor runs, clean dataset exports, and route valid, role-based, catch-all, invalid, and unknown emails before sync. - [Best Google Maps Email Extractor Tools](https://billionverify.com/google-maps/best-google-maps-email-extractor-tools.md): Compare the leading Google Maps email extractor tools, including where email verification fits before records enter a CRM, sender, or outreach workflow. - [D7 Lead Finder Email Verification](https://billionverify.com/google-maps/d7-lead-finder.md): Add email verification after D7 Lead Finder exports, route valid, role-based, catch-all, invalid, and unknown emails before CRM import or outreach. - [Google Maps Dentist Email Verification](https://billionverify.com/google-maps/dentists.md): Verify dentist emails from Google Maps exports, route valid, role-based, catch-all, and invalid results before outreach or CRM import. - [GMaps Extractor Email Verification](https://billionverify.com/google-maps/gmaps-extractor.md): Add email verification after GMaps Extractor exports, clean contact data, and route valid, role-based, catch-all, invalid, and unknown results before import. - [GMaps Extractor vs Outscraper for Google Maps Leads](https://billionverify.com/google-maps/gmaps-extractor-vs-outscraper.md): Compare GMaps Extractor and Outscraper for Google Maps lead exports, including where email verification fits before records enter a CRM, sender, or outreach. - [Google Maps Email Extractor](https://billionverify.com/google-maps/google-maps-email-extractor.md): Verify emails extracted from Google Maps business listings, route valid, role-based, catch-all, and invalid results before sending or CRM import. - [Google Maps Email Finder](https://billionverify.com/google-maps/google-maps-email-finder.md): Verify emails found through Google Maps searches, route valid, role-based, catch-all, and invalid results before sending or CRM import. - [Google Maps Leads Scraper](https://billionverify.com/google-maps/google-maps-leads-scraper.md): Verify emails from Google Maps lead scraper exports, route valid, role-based, catch-all, and invalid results before sending or CRM import. - [Google Maps to Cold Email Workflow](https://billionverify.com/google-maps/google-maps-to-cold-email-workflow.md): Build a repeatable Google Maps to cold email workflow by verifying emails, routing valid and role-based records, and suppressing invalid addresses before send. - [Google Maps vs LinkedIn for Local B2B Prospecting](https://billionverify.com/google-maps/google-maps-vs-linkedin-for-local-b2b-prospecting.md): Compare Google Maps and LinkedIn for local B2B prospecting lists, including where email verification fits before records enter a CRM, sender, or outreach tool. - [Google Maps vs Yellow Pages for Local Outreach](https://billionverify.com/google-maps/google-maps-vs-yellow-pages.md): Compare Google Maps and Yellow Pages for local business outreach lists, including where email verification fits before records enter a CRM, sender, or outreach. - [Google Maps vs Yelp for Local Outreach](https://billionverify.com/google-maps/google-maps-vs-yelp-for-local-outreach.md): Compare Google Maps and Yelp for local business outreach lists, including where email verification fits before records enter a CRM, sender, or outreach tool. - [Google Maps Lawyer Email Verification](https://billionverify.com/google-maps/lawyers.md): Verify lawyer and law firm emails from Google Maps exports, route valid, role-based, catch-all, and invalid results before outreach or CRM import. - [Local Scraper Email Verification](https://billionverify.com/google-maps/local-scraper.md): Add email verification after Local Scraper exports, route valid, role-based, catch-all, invalid, and unknown emails before CRM import or outreach. - [MapsLeads Email Verification](https://billionverify.com/google-maps/mapsleads.md): Add email verification after MapsLeads exports, route valid, role-based, catch-all, invalid, and unknown emails before CRM import or outreach. - [Google Maps Multi-Location Business Email Verification](https://billionverify.com/google-maps/multi-location-businesses.md): Verify emails from multi-location and franchise Google Maps exports, deduplicate chain records, and route valid, role-based, catch-all, and invalid results. - [Outscraper Email Verification](https://billionverify.com/google-maps/outscraper.md): Add email verification after Outscraper Google Maps exports, clean contact lists, and route valid, role-based, catch-all, invalid, and unknown emails before. - [Outscraper vs Apify for Google Maps Leads](https://billionverify.com/google-maps/outscraper-vs-apify-for-google-maps-leads.md): Compare Outscraper and Apify for Google Maps lead extraction, including where email verification fits before records enter a CRM, sender, or outreach tool. - [Outscraper vs Scrap.io for Google Maps Leads](https://billionverify.com/google-maps/outscraper-vs-scrap-io.md): Compare Outscraper and Scrap.io for Google Maps lead exports, including where email verification fits before records enter a CRM, sender, or outreach workflow. - [Google Maps Plumber Email Verification](https://billionverify.com/google-maps/plumbers.md): Verify plumber emails from Google Maps exports, route valid, role-based, catch-all, and invalid results before outreach or CRM import. - [Google Maps Real Estate Email Verification](https://billionverify.com/google-maps/real-estate.md): Verify real estate agent and agency emails from Google Maps exports, route valid, role-based, catch-all, and invalid results before outreach or CRM import. - [Google Maps Restaurant Email Verification](https://billionverify.com/google-maps/restaurants.md): Verify restaurant emails from Google Maps exports, route valid, role-based, catch-all, and invalid results before outreach or CRM import. - [Google Maps Roofer Email Verification](https://billionverify.com/google-maps/roofers.md): Verify roofing contractor emails from Google Maps exports, route valid, role-based, catch-all, and invalid results before outreach or CRM import. - [Scrap.io Email Verification](https://billionverify.com/google-maps/scrap-io.md): Add email verification after Scrap.io Google Maps exports, clean contact lists, and route valid, role-based, catch-all, invalid, and unknown emails before sync. - [Cold Email Verification Framework](https://billionverify.com/cold-email.md): Verify emails before warmup, import, and cold email campaigns. Protect sender reputation with a clear pre-send quality gate. - [Autoklose Email Verification](https://billionverify.com/cold-email/autoklose.md): Verify emails before importing into Autoklose. Remove invalid records and segment risky addresses before automated sequences run. - [Built-In Verifier vs Third-Party Email Verification](https://billionverify.com/cold-email/built-in-verifier-vs-third-party-email-verification.md): Compare built-in email verification from cold email senders with dedicated third-party verification tools. - [Catch-All Policy for Cold Email](https://billionverify.com/cold-email/catch-all-policy-for-cold-email.md): Define your catch-all email policy for cold outreach. Segment catch-all results before import and apply the right volume and risk rules per campaign. - [Close CRM Email Verification](https://billionverify.com/cold-email/close.md): Verify emails in Close CRM before sequences run. Remove invalid contact records and segment risky addresses before outbound campaigns. - [Cold Email Bounce Rate Control](https://billionverify.com/cold-email/cold-email-bounce-rate-control.md): Control cold email bounce rate by fixing list quality upstream. Remove invalid records, segment catch-all, and apply pre-import verification before every. - [Folderly + BillionVerify Workflow](https://billionverify.com/cold-email/folderly-workflow.md): Combine BillionVerify list verification with Folderly deliverability optimization. - [Gmail Sender vs Cold Email Infrastructure](https://billionverify.com/cold-email/gmail-sender-vs-cold-email-infrastructure.md): Compare Gmail-based senders (GMass, Mailmeteor, Yesware) with dedicated cold email infrastructure (Instantly, Smartlead, Mailforge). - [GMass Email Verification](https://billionverify.com/cold-email/gmass.md): Verify emails before sending with GMass. Check your Google Sheets list before Gmail campaigns to reduce bounce rate and protect your Gmail account health. - [GMass vs BillionVerify for Email Verification](https://billionverify.com/cold-email/gmass-vs-billionverify-for-email-verification.md): Compare GMass and BillionVerify for email verification. GMass sends from Gmail — BillionVerify verifies the list before it enters. - [GMass vs Mailmeteor](https://billionverify.com/cold-email/gmass-vs-mailmeteor.md): Compare GMass and Mailmeteor for Gmail-based cold email. Both use Google Sheets lists — understand the pre-send verification differences between the two. - [Instantly Email Verification](https://billionverify.com/cold-email/instantly.md): Verify emails before importing lists into Instantly. Remove invalid records and segment catch-all, role-based, and unknown addresses before campaign launch. - [Instantly vs BillionVerify for Verification](https://billionverify.com/cold-email/instantly-vs-billionverify-for-verification.md): Compare Instantly's built-in verification with BillionVerify as a dedicated pre-send layer. - [Instantly vs Lemlist](https://billionverify.com/cold-email/instantly-vs-lemlist.md): Compare Instantly and Lemlist for cold email. Scaled multi-inbox vs multi-channel personalization — understand the pre-send verification workflow for each. - [Instantly vs Smartlead](https://billionverify.com/cold-email/instantly-vs-smartlead.md): Compare Instantly and Smartlead for cold email deliverability. Both handle high-volume sending — understand where list verification fits in each workflow. - [Klenty Email Verification](https://billionverify.com/cold-email/klenty.md): Verify emails before importing into Klenty. Remove invalid CRM-sourced records and segment risky addresses before cadences run. - [Lavender + BillionVerify Workflow](https://billionverify.com/cold-email/lavender.md): Combine BillionVerify list verification with Lavender email writing. Verify contacts before Lavender personalizes messages — ensure AI effort goes toward real,. - [Lemlist Email Verification](https://billionverify.com/cold-email/lemlist.md): Verify emails before importing lists into Lemlist. Remove invalid records and segment catch-all, role-based, and unknown addresses before multi-channel. - [Lemlist vs BillionVerify](https://billionverify.com/cold-email/lemlist-vs-billionverify.md): Compare Lemlist and BillionVerify. Lemlist runs multi-channel campaigns — BillionVerify verifies the list before any channel receives it. - [Lemlist vs Smartlead](https://billionverify.com/cold-email/lemlist-vs-smartlead.md): Compare Lemlist and Smartlead for cold email. Multi-channel personalization vs high-volume scale — understand the verification differences between the two. - [Mailforge + BillionVerify Workflow](https://billionverify.com/cold-email/mailforge-workflow.md): Combine BillionVerify with Mailforge cold email infrastructure. Verify emails before Mailforge sends campaigns — protect infrastructure investment with a clean. - [Mailmeteor Email Verification](https://billionverify.com/cold-email/mailmeteor.md): Verify emails in your Google Sheets list before sending with Mailmeteor. Protect your Gmail account from bounce-related damage. - [Mailshake Email Verification](https://billionverify.com/cold-email/mailshake.md): Verify emails before importing lists into Mailshake. Remove invalid records and segment risky addresses before outbound campaigns launch. - [Mailshake vs BillionVerify](https://billionverify.com/cold-email/mailshake-vs-billionverify.md): Compare Mailshake and BillionVerify. Mailshake runs outbound campaigns — BillionVerify verifies the list before import. Understand the workflow split. - [Mailshake vs Reply.io](https://billionverify.com/cold-email/mailshake-vs-reply-io.md): Compare Mailshake and Reply.io for outbound email. Single-channel vs multi-channel sending — understand where list verification fits in each workflow. - [Mixmax Email Verification](https://billionverify.com/cold-email/mixmax.md): Verify emails before Mixmax Gmail sequences. Remove invalid records and protect Gmail account health from bounce-related damage. - [Outreach Email Verification](https://billionverify.com/cold-email/outreach.md): Verify emails before enrolling contacts into Outreach sequences. Remove invalid records and segment risky addresses before multi-step campaigns run. - [Overloop Email Verification](https://billionverify.com/cold-email/overloop.md): Verify emails before importing into Overloop. Remove invalid records and segment risky addresses before outbound sequences start. - [PersistIQ Email Verification](https://billionverify.com/cold-email/persistiq.md): Verify emails before importing into PersistIQ. Remove invalid records and segment risky addresses before SDR sequences run. - [Pre-Import List Cleaning](https://billionverify.com/cold-email/pre-import-list-cleaning.md): Clean email lists before importing into any cold email sender or CRM. A consistent pre-import verification workflow prevents invalid records from entering. - [QuickMail Email Verification](https://billionverify.com/cold-email/quickmail.md): Verify emails before importing lists into QuickMail. Remove invalid records and segment catch-all and risky addresses before campaign launch. - [Reply.io Email Verification](https://billionverify.com/cold-email/reply-io.md): Verify emails before importing into Reply.io. Remove invalid records and segment risky addresses before multi-channel sequences run. - [Saleshandy Email Verification](https://billionverify.com/cold-email/saleshandy.md): Verify emails before importing into Saleshandy. Remove invalid records and segment risky addresses before cold email campaigns. - [Salesloft Email Verification](https://billionverify.com/cold-email/salesloft.md): Verify emails before importing contacts into Salesloft. Remove invalid records and segment risky addresses before sequences run. - [Salesloft vs Outreach](https://billionverify.com/cold-email/salesloft-vs-outreach.md): Compare Salesloft and Outreach for enterprise sales engagement. Both handle large contact volumes — understand the pre-import verification requirements for. - [SendBuzz Email Verification](https://billionverify.com/cold-email/sendbuzz.md): Verify emails before importing into SendBuzz. Remove invalid records and segment risky addresses before cold email campaigns run. - [Smartlead Email Verification](https://billionverify.com/cold-email/smartlead.md): Verify emails before importing lists into Smartlead. Remove invalid records and segment catch-all, role-based, and unknown addresses before high-volume. - [Smartlead vs BillionVerify for List Cleaning](https://billionverify.com/cold-email/smartlead-vs-billionverify-for-list-cleaning.md): Compare Smartlead and BillionVerify for list cleaning. Understand what Smartlead handles and where a dedicated pre-import verification layer fills the gap. - [Verify Emails Before Warmup](https://billionverify.com/cold-email/verify-before-warmup.md): Verify your email list before starting domain warmup. Warmup builds sender reputation — but only if the list it runs on is already clean. - [Warmup vs Email Verification](https://billionverify.com/cold-email/warmup-vs-email-verification.md): Understand the difference between warmup and email verification in cold outreach. Each solves a different problem — neither replaces the other. - [Woodpecker Email Verification](https://billionverify.com/cold-email/woodpecker.md): Verify emails before importing into Woodpecker. Remove invalid records and segment risky addresses before cold email sequences run. - [Yesware Email Verification](https://billionverify.com/cold-email/yesware.md): Verify emails before Yesware Gmail campaigns. Remove invalid records and protect your Gmail account health from bounce-related damage. - [B2B Leads Email Verification](https://billionverify.com/b2b-leads.md): Verify emails from Apollo, ZoomInfo, Hunter, and other B2B data sources before sending. Database confidence scores are not the same as email deliverability. - [Adapt.io Email Verification](https://billionverify.com/b2b-leads/adapt-io.md): Verify Adapt.io email exports before sending. Adapt.io contact database exports require an independent verification pass to confirm deliverability before CRM. - [AeroLeads Email Verification](https://billionverify.com/b2b-leads/aeroleads.md): Verify AeroLeads email exports before sending. AeroLeads prospecting and LinkedIn data require an independent SMTP verification pass before import into your. - [Apollo Email Verification](https://billionverify.com/b2b-leads/apollo.md): Verify Apollo.io email exports before importing into your CRM or cold email sender. - [Apollo vs BillionVerify for Email Verification](https://billionverify.com/b2b-leads/apollo-vs-billionverify-for-email-verification.md): Apollo uses confidence scores to rate email quality. BillionVerify runs an independent SMTP check. - [Apollo vs Hunter for Email Verification](https://billionverify.com/b2b-leads/apollo-vs-hunter-for-verification.md): Compare Apollo and Hunter for email verification quality. Apollo uses confidence scores; Hunter includes a built-in verifier. - [Apollo vs ZoomInfo for B2B Leads](https://billionverify.com/b2b-leads/apollo-vs-zoominfo.md): Compare Apollo and ZoomInfo for B2B email data quality, export characteristics, and verification needs. - [B2B Database Email Verification](https://billionverify.com/b2b-leads/b2b-database-verification.md): Verify B2B database exports before import. Any B2B database — Apollo, ZoomInfo, Lusha, Cognism — produces contacts that need an independent SMTP deliverability. - [B2B Database vs Email Finder: Which Needs More Verification?](https://billionverify.com/b2b-leads/b2b-database-vs-email-finder.md): Compare B2B database exports and email finder output for verification needs. Database and finder sources produce different email risk profiles that require. - [Clearbit Enrichment Email Verification](https://billionverify.com/b2b-leads/clearbit-enrichment.md): Verify Clearbit enriched emails before sending. Clearbit enrichment data quality reflects record matching accuracy, not current SMTP deliverability — verify. - [Cognism Email Verification](https://billionverify.com/b2b-leads/cognism.md): Verify Cognism email exports before sending. Cognism enterprise EMEA data and Diamond data verification are not substitutes for an independent SMTP. - [ContactOut Email Verification](https://billionverify.com/b2b-leads/contactout.md): Verify ContactOut email exports before sending. LinkedIn-sourced contacts and personal emails from ContactOut require a final deliverability check before any. - [ContactOut vs Lusha for LinkedIn-Sourced Data](https://billionverify.com/b2b-leads/contactout-vs-lusha.md): Compare ContactOut and Lusha for LinkedIn-sourced contact data and email quality. - [Datanyze Email Verification](https://billionverify.com/b2b-leads/datanyze.md): Verify Datanyze email exports before sending. Datanyze technographic data and contact information require a final SMTP deliverability check before outreach. - [Dropcontact Email Verification](https://billionverify.com/b2b-leads/dropcontact.md): Verify Dropcontact enriched email data before sending. Dropcontact enrichment accuracy reflects data matching quality, not current SMTP deliverability — verify. - [Email Finder Verification Workflow](https://billionverify.com/b2b-leads/email-finder-workflow.md): Verify emails from any finder tool before they enter your CRM or sender. A consistent post-finder verification workflow removes invalid, catch-all, and. - [Findymail Email Verification](https://billionverify.com/b2b-leads/findymail.md): Verify Findymail output before sending. Findymail confidence scores reflect pattern-matching accuracy, not current SMTP deliverability — verify before CRM. - [GetProspect Email Verification](https://billionverify.com/b2b-leads/getprospect.md): Verify GetProspect email output before importing into your CRM or sender. LinkedIn-sourced contacts from GetProspect require a final SMTP deliverability check. - [Hunter Email Verification](https://billionverify.com/b2b-leads/hunter.md): Verify emails found with Hunter.io before sending. Hunter's verifier checks format and domain — an independent SMTP check catches what Hunter's built-in. - [Hunter vs BillionVerify for Email Verification](https://billionverify.com/b2b-leads/hunter-vs-billionverify.md): Hunter includes a built-in email verifier. BillionVerify provides an independent SMTP check at the moment of import. - [Kaspr Email Verification](https://billionverify.com/b2b-leads/kaspr.md): Verify Kaspr email exports before sending. Kaspr LinkedIn-sourced contact data and direct dial output require an independent deliverability check before. - [Lead411 Email Verification](https://billionverify.com/b2b-leads/lead411.md): Verify Lead411 email exports before importing into your CRM or sender. Lead411 intent data and verified contacts still require an independent SMTP check before. - [LinkedIn Email Finder Verification](https://billionverify.com/b2b-leads/linkedin-email-finder.md): Verify emails found from LinkedIn profiles before sending. LinkedIn email finders produce pattern-matched and sourced addresses that need an independent SMTP. - [LinkedIn Sales Navigator Email Verification](https://billionverify.com/b2b-leads/linkedin-sales-navigator.md): Verify emails sourced from LinkedIn Sales Navigator. Sales Navigator finds contacts but not emails — use a finder tool and verify output before any outreach or. - [LinkedIn Sales Navigator vs Apollo for Prospecting](https://billionverify.com/b2b-leads/linkedin-sales-navigator-vs-apollo-for-prospecting.md): Compare LinkedIn Sales Navigator and Apollo for B2B prospecting and email verification. - [Lusha Email Verification](https://billionverify.com/b2b-leads/lusha.md): Verify Lusha email exports before importing into your CRM or sender. Lusha EMEA and LinkedIn-sourced contacts need an independent deliverability check before. - [Lusha vs Cognism for EMEA Contact Data](https://billionverify.com/b2b-leads/lusha-vs-cognism.md): Compare Lusha and Cognism for EMEA B2B contact data quality and email verification requirements. - [Prospect.io Email Verification](https://billionverify.com/b2b-leads/prospect-io.md): Verify Prospect.io email exports before sending. Prospect.io sales automation and prospecting data require an independent SMTP verification pass before CRM. - [RocketReach Email Verification](https://billionverify.com/b2b-leads/rocketreach.md): Verify RocketReach email exports before importing into your CRM or sender. RocketReach contact data includes catch-all domains and stale records that need a. - [RocketReach vs Apollo for B2B Email Quality](https://billionverify.com/b2b-leads/rocketreach-vs-apollo.md): Compare RocketReach and Apollo for B2B contact data quality and verification needs. - [RocketReach vs BillionVerify for Email Verification](https://billionverify.com/b2b-leads/rocketreach-vs-billionverify.md): RocketReach sources contacts and emails. BillionVerify verifies deliverability at the moment of import. - [Sales Intelligence Data Quality and Email Verification](https://billionverify.com/b2b-leads/sales-intelligence-data-quality.md): Understand data quality signals from sales intelligence tools and when to verify. - [Saleshandy Leads Verification](https://billionverify.com/b2b-leads/saleshandy-leads.md): Verify Saleshandy B2B lead data before sending. Saleshandy platform-sourced contacts require an independent SMTP deliverability check before they enter any. - [SalesQL Email Verification](https://billionverify.com/b2b-leads/salesql.md): Verify SalesQL email output before sending. LinkedIn-based email finder results from SalesQL need an independent SMTP verification pass before CRM import or. - [Seamless.AI Email Verification](https://billionverify.com/b2b-leads/seamless-ai.md): Verify Seamless.AI email exports before sending. AI-discovered contact data and real-time search results still require an independent SMTP verification pass. - [SignalHire Email Verification](https://billionverify.com/b2b-leads/signalhire.md): Verify SignalHire email exports before sending. SignalHire LinkedIn-sourced contact data requires a final SMTP deliverability check before any outreach. - [Skrapp Email Verification](https://billionverify.com/b2b-leads/skrapp.md): Verify Skrapp email output before sending. Skrapp pattern-based email discovery requires an independent SMTP verification pass before contacts enter a CRM or. - [Snov.io Email Verification](https://billionverify.com/b2b-leads/snov-io.md): Verify Snov.io email finder output before sending. Snov.io pattern-based discovery and built-in verification do not replace an independent SMTP deliverability. - [Snov.io vs BillionVerify for Email Verification](https://billionverify.com/b2b-leads/snov-io-vs-billionverify.md): Snov.io is an all-in-one finder with built-in verification. BillionVerify provides an independent SMTP check. Understand what Snov. - [Snov.io vs Hunter for Email Finding and Verification](https://billionverify.com/b2b-leads/snov-io-vs-hunter.md): Compare Snov.io and Hunter for email finding and verification. Both tools include built-in verification — understand what each covers and when an independent. - [UpLead Email Verification](https://billionverify.com/b2b-leads/uplead.md): Verify UpLead email exports before importing into your CRM or sender. UpLead's 95% data accuracy guarantee refers to data quality at collection, not ongoing. - [Verified Database vs Third-Party Email Verification](https://billionverify.com/b2b-leads/verified-database-vs-third-party-email-verification.md): Understand what a database-verified label means versus an independent SMTP check. - [Voila Norbert Email Verification](https://billionverify.com/b2b-leads/voila-norbert.md): Verify Voila Norbert email output before sending. Voila Norbert finder confidence scores reflect discovery accuracy, not current SMTP deliverability — verify. - [Wiza Email Verification](https://billionverify.com/b2b-leads/wiza.md): Verify Wiza email exports before sending. Wiza LinkedIn Sales Navigator workflow output requires an independent SMTP verification pass before it enters your. - [ZoomInfo Email Verification](https://billionverify.com/b2b-leads/zoominfo.md): Verify ZoomInfo email exports before importing into your CRM or sender. Enterprise-grade data enrichment does not guarantee current email deliverability. - [ZoomInfo vs BillionVerify for List Cleaning](https://billionverify.com/b2b-leads/zoominfo-vs-billionverify-for-list-cleaning.md): ZoomInfo provides enterprise data quality. BillionVerify provides SMTP-level deliverability verification. - [ZoomInfo vs Cognism for Enterprise B2B Data](https://billionverify.com/b2b-leads/zoominfo-vs-cognism.md): Compare ZoomInfo and Cognism for enterprise B2B data quality and email deliverability. - [Local Business Email Verification](https://billionverify.com/local-business.md): Verify emails from Yellow Pages, Yelp, BBB, and other local directories. Local business email lists have high rates of shared inboxes, catch-all domains, and. - [Angi Email Verification](https://billionverify.com/local-business/angi.md): Verify emails from Angi (formerly Angie's List) home service and contractor listings. - [Angi vs Bark for Local Service Email Leads](https://billionverify.com/local-business/angi-vs-bark-for-local-service-leads.md): Compare Angi and Bark as sources for local service professional email leads. Both are service marketplaces — email discovery and verification requirements. - [Bark Email Verification](https://billionverify.com/local-business/bark.md): Verify emails sourced from Bark.com local service provider listings. Bark is a lead marketplace — pro contact emails require website or profile discovery. - [BBB Email Verification](https://billionverify.com/local-business/bbb.md): Verify emails sourced from Better Business Bureau profiles before outreach. BBB profiles carry trust signals but contact data still needs verification before. - [BBB vs Clutch for B2B Service Prospecting](https://billionverify.com/local-business/bbb-vs-clutch-for-b2b-service-prospecting.md): Compare BBB and Clutch as B2B service prospecting sources. BBB covers local businesses across all categories; Clutch specializes in digital agencies, IT firms,. - [Best Local Business Directories for Email Outreach](https://billionverify.com/local-business/best-local-business-directories-for-email-outreach.md): Compare Yellow Pages, BBB, Yelp, Angi, Bark, Thumbtack, and Manta by email quality, direct email availability, and verification requirements for local outreach. - [Chamber of Commerce Email Verification](https://billionverify.com/local-business/chamber-of-commerce.md): Verify emails sourced from local chamber of commerce member directories. Chamber membership implies local business legitimacy but does not guarantee current,. - [Contractor Email Verification](https://billionverify.com/local-business/contractors.md): Verify emails for contractor and trades businesses sourced from directories like Angi, Thumbtack, and Yellow Pages. - [Home Services Email Verification](https://billionverify.com/local-business/home-services.md): Verify emails for home service businesses sourced from Angi, Thumbtack, Bark, and local directories. - [Houzz Pros Email Verification](https://billionverify.com/local-business/houzz-pros.md): Verify emails sourced from Houzz pro profiles. Houzz is a home improvement vertical directory — pro contact emails require website or profile discovery before. - [Info@ Email Filtering](https://billionverify.com/local-business/info-at-email-filtering.md): Filter and route info@, contact@, service@, and other generic local business inboxes. - [Local Business Email List Cleaning](https://billionverify.com/local-business/local-business-email-list-cleaning.md): Clean local business email lists before outreach. Local directories produce lists with high rates of role-based inboxes, catch-all domains, and stale addresses. - [Local Directory Email Verification](https://billionverify.com/local-business/local-directory-email-verification.md): Compare local business directory sources — Yellow Pages, BBB, Yelp, Manta, and more — by email quality, contact path, and verification requirements before. - [Manta Email Verification](https://billionverify.com/local-business/manta.md): Verify emails sourced from Manta small business directory listings. Manta provides business profiles with contact data — verify before outreach due to listing. - [Thumbtack Email Verification](https://billionverify.com/local-business/thumbtack.md): Verify emails sourced from Thumbtack local service pro listings. Thumbtack is a service marketplace — pro contact emails require website or profile discovery. - [Website-Derived Local Business Emails](https://billionverify.com/local-business/website-derived-local-emails.md): Verify emails discovered from local business websites after collecting listings from directories like Yelp, BBB, or Angi. - [Yellow Pages Email Verification](https://billionverify.com/local-business/yellow-pages.md): Verify emails sourced from Yellow Pages listings before outreach. YP listings contain a mix of direct emails, generic inboxes, and stale contact data that. - [Yellow Pages vs BBB for Local Email Leads](https://billionverify.com/local-business/yellow-pages-vs-bbb.md): Compare Yellow Pages and BBB as sources for local business email leads. Yellow Pages is a volume directory; BBB adds trust signals. - [Yellow Pages vs Yelp for Local Email Leads](https://billionverify.com/local-business/yellow-pages-vs-yelp-for-local-leads.md): Compare Yellow Pages and Yelp as sources for local business email leads. Yellow Pages often lists email directly; Yelp rarely does and requires website. - [Yelp Email Verification](https://billionverify.com/local-business/yelp.md): Verify emails sourced from Yelp listings before outreach. Yelp seldom lists email directly — email usually comes from the business website linked from the. - [B2B Agency Email Verification](https://billionverify.com/b2b-agency.md): Verify emails sourced from Clutch, DesignRush, G2, and other agency directories. Agency listing data requires email discovery and verification before outreach. - [Agency Email Finder Workflow](https://billionverify.com/b2b-agency/agency-email-finder-workflow.md): A repeatable workflow for finding and verifying email addresses from agency directories like Clutch, DesignRush, and G2 before outreach. - [Agency Spotter Email Verification](https://billionverify.com/b2b-agency/agency-spotter.md): Verify emails sourced from Agency Spotter creative agency profiles before outreach. - [B2B Service Provider Email Verification](https://billionverify.com/b2b-agency/b2b-service-providers.md): Find and verify emails from B2B service providers — consulting firms, IT agencies, SaaS companies, and professional services — before any outreach campaign. - [Capterra Email Verification](https://billionverify.com/b2b-agency/capterra.md): Verify emails sourced from Capterra software directory listings before outreach. Capterra provides company data — finding and verifying the email requires. - [Clutch Agency Email Verification](https://billionverify.com/b2b-agency/clutch.md): Verify emails sourced from Clutch.co agency profiles before outreach. Clutch listings provide company data — finding and verifying the email requires. - [Clutch vs DesignRush for Agency Outreach](https://billionverify.com/b2b-agency/clutch-vs-designrush.md): Clutch and DesignRush list different agency types with different profile depth. This comparison covers which directory fits your outreach goal and how email. - [Clutch vs LinkedIn for Agency Leads](https://billionverify.com/b2b-agency/clutch-vs-linkedin-for-agency-leads.md): Clutch starts with the company; LinkedIn starts with the person. Both need email discovery and verification before outreach. Learn how to combine them. - [Clutch vs Trustpilot for B2B Outreach](https://billionverify.com/b2b-agency/clutch-vs-trustpilot-for-b2b-outreach.md): Clutch and Trustpilot serve different B2B prospecting purposes. Compare account type coverage, email quality patterns, and when to use each source for outreach. - [Competitor Customer Email Prospecting](https://billionverify.com/b2b-agency/competitor-customer-prospecting.md): Find and verify emails for companies that reviewed a competitor on G2 or Capterra. - [DesignRush Agency Email Verification](https://billionverify.com/b2b-agency/designrush.md): Verify emails sourced from DesignRush agency listings before outreach. DesignRush finds creative agencies — email discovery and verification are separate steps. - [G2 Lead Email Verification](https://billionverify.com/b2b-agency/g2.md): Verify emails sourced from G2 software listings and reviewer profiles before outreach. - [G2 vs Capterra for Competitor Customer Sourcing](https://billionverify.com/b2b-agency/g2-vs-capterra-for-competitor-sourcing.md): G2 and Capterra both surface competitor customer lists. The difference is which companies appear and what type of buyer leaves reviews on each platform. - [GoodFirms Email Verification](https://billionverify.com/b2b-agency/goodfirms.md): Verify emails sourced from GoodFirms agency and software listings before outreach. GoodFirms covers both categories — email discovery is a separate step. - [Review Sites vs B2B Databases for Prospecting](https://billionverify.com/b2b-agency/review-sites-vs-b2b-databases-for-prospecting.md): Review sites and B2B databases solve different parts of the prospecting problem. Both require email verification — the quality risks are just different. - [SaaS Company Email Verification from Review Sites](https://billionverify.com/b2b-agency/saas-companies-from-review-sites.md): Find and verify emails from SaaS companies discovered on G2 and Capterra. Review site listings give you the domain — this workflow takes you from category page. - [Sortlist Agency Email Verification](https://billionverify.com/b2b-agency/sortlist.md): Verify emails sourced from Sortlist agency profiles before outreach. Sortlist specializes in European agency matching — finding and verifying the email. - [Trustpilot Company Email Verification](https://billionverify.com/b2b-agency/trustpilot.md): Verify emails sourced from Trustpilot company profiles before outreach. Trustpilot shows active businesses — finding and verifying the email requires. - [UpCity Agency Email Verification](https://billionverify.com/b2b-agency/upcity.md): Verify emails sourced from UpCity agency listings before outreach. UpCity provides local agency discovery — finding and verifying the email requires additional. - [Verified Agency Email Lists](https://billionverify.com/b2b-agency/verified-agency-email-lists.md): How to build, clean, and maintain verified agency email lists from directory sources like Clutch and DesignRush using BillionVerify as the quality gate. ### Comparisons - [BillionVerify: Best Email Verification Alternatives](https://billionverify.com/vs.md): Email checker and email verification comparisons. Compare BillionVerify vs NeverBounce, ZeroBounce. Free email checker from BillionVerify. - [MyEmailVerifier Review: Is It Worth It? (2026)](https://billionverify.com/vs/myemailverifier.md): MyEmailVerifier email checker alternative. Free email checker and email verification from BillionVerify. - [Proofy Review: Is It Worth It? (2026)](https://billionverify.com/vs/proofy.md): Proofy email checker alternative. Free email checker and email verification from BillionVerify. - [QuickEmailVerification Review: Is It Worth It? (2026)](https://billionverify.com/vs/quickemailverification.md): QuickEmailVerification email checker alternative. Free email checker and email verification from BillionVerify. - [Reoon Review: Is It Worth It? (2026)](https://billionverify.com/vs/reoon.md): Reoon email checker alternative. Free email checker and email verification from BillionVerify. - [VoilaNorbert Review: Is It Worth It? (2026)](https://billionverify.com/vs/voilanorbert.md): VoilaNorbert email checker alternative. Free email checker and email verification from BillionVerify. - [Best Email Verification Tools 2026 Compared](https://billionverify.com/best-email-verification-tools.md): Best email verification tools 2026, compared on SMTP accuracy, catch-all handling, price per email, and free tier. Independent criteria, not vendor claims. - [Best Email Validation Service 2026 Compared](https://billionverify.com/best-email-validation-service.md): Best email validation service 2026, compared on SMTP accuracy, cost at real volume, support, and data handling. Buying criteria, not vendor marketing. - [Best Email Verification API 2026 Compared](https://billionverify.com/best-email-verification-api.md): Best email verification API 2026, compared on latency, response schema, auth, rate limits, and cost per call. Developer criteria, not vendor claims. - [NeverBounce Review: Is It Worth It? (2026)](https://billionverify.com/vs/neverbounce.md): NeverBounce email checker alternative. Free email checker and email verification from BillionVerify. - [ZeroBounce Review: Is It Worth It? (2026)](https://billionverify.com/vs/zerobounce.md): ZeroBounce email checker alternative. Free email checker and email verification from BillionVerify. - [Hunter.io Review: Is It Worth It? (2026)](https://billionverify.com/vs/hunter.md): Hunter.io email checker alternative. Free email checker and email verification from BillionVerify. - [Bouncer Review: Is It Worth It? (2026)](https://billionverify.com/vs/bouncer.md): Bouncer email checker alternative. Free email checker and email verification from BillionVerify. - [Kickbox Review: Is It Worth It? (2026)](https://billionverify.com/vs/kickbox.md): Kickbox email checker alternative. Free email checker and email verification from BillionVerify. - [EmailListVerify Review: Is It Worth It? (2026)](https://billionverify.com/vs/emaillistverify.md): EmailListVerify email checker alternative. Free email checker and email verification from BillionVerify. - [Verifalia Review: Is It Worth It? (2026)](https://billionverify.com/vs/verifalia.md): Verifalia email checker alternative. Free email checker and email verification from BillionVerify. - [DeBounce Review: Is It Worth It? (2026)](https://billionverify.com/vs/debounce.md): DeBounce review and BillionVerify alternative. Compare accuracy, pricing, and speed before you decide. - [MillionVerifier Review: Is It Worth It? (2026)](https://billionverify.com/vs/millionverifier.md): MillionVerifier email checker alternative. Free email checker and email verification from BillionVerify. - [Emailable Review: Is It Worth It? (2026)](https://billionverify.com/vs/emailable.md): Emailable email checker alternative. Free email checker and email verification from BillionVerify. - [Snov.io Review: Is It Worth It? (2026)](https://billionverify.com/vs/snov.md): Snov.io email checker alternative. Free email checker and email verification from BillionVerify. - [Findymail Review: Is It Worth It? (2026)](https://billionverify.com/vs/findymail.md): Findymail email checker alternative. Free email checker and email verification from BillionVerify. - [Validity Review: Is It Worth It? (2026)](https://billionverify.com/vs/validity.md): Validity (BriteVerify) email verification alternative. Free email checker and email verification from BillionVerify. ### Email Guides - [BillionVerify: Email Glossary & Terminology Guide](https://billionverify.com/glossary.md): Complete guide to email marketing, deliverability, spam filtering, and authentication. Master essential email concepts with BillionVerify. - [Email Technical](https://billionverify.com/glossary/category/email-technical.md) - [Email Tools](https://billionverify.com/glossary/category/email-tools.md) - [Email Basics](https://billionverify.com/glossary/category/email-basics.md) - [List Management](https://billionverify.com/glossary/category/list-management.md) - [Email Deliverability](https://billionverify.com/glossary/category/email-deliverability.md) - [Email Verification](https://billionverify.com/glossary/category/email-verification.md) - [Email Authentication](https://billionverify.com/glossary/category/email-authentication.md) - [Email Types](https://billionverify.com/glossary/category/email-types.md) - [Spam & Blacklist](https://billionverify.com/glossary/category/spam-blacklist.md) - [Email Marketing](https://billionverify.com/glossary/category/email-marketing.md) - [Email How-To Guides & Best Practices | BillionVerify](https://billionverify.com/guides.md): Step-by-step guides on email verification, reducing bounce rates, and email best practices. - [The Email Marketing Bible](https://billionverify.com/email-marketing-bible.md): The definitive guide to email marketing — from fundamentals to advanced strategies. Covers list building, segmentation, deliverability, copywriting, compliance, and more. - [AI and the Future of Email](https://billionverify.com/email-marketing-bible/ai-and-the-future-of-email.md): AI and the Future of Email — from The Email Marketing Bible. - [Analytics and Measurement](https://billionverify.com/email-marketing-bible/analytics-and-measurement.md): Analytics and Measurement — from The Email Marketing Bible. - [Appendix A: Benchmarks by Industry](https://billionverify.com/email-marketing-bible/appendix-a-benchmarks.md): Appendix A: Benchmarks by Industry — from The Email Marketing Bible. - [Appendix B: Email Frequency Guide](https://billionverify.com/email-marketing-bible/appendix-b-frequency-guide.md): Appendix B: Email Frequency Guide — from The Email Marketing Bible. - [Appendix C: Email Marketing Calendar](https://billionverify.com/email-marketing-bible/appendix-c-calendar.md): Appendix C: Email Marketing Calendar — from The Email Marketing Bible. - [Appendix D: Methodology and Sources](https://billionverify.com/email-marketing-bible/appendix-d-methodology.md): Appendix D: Methodology and Sources — from The Email Marketing Bible. - [Best Email Designs of 2026](https://billionverify.com/email-marketing-bible/best-email-designs-2026.md): Best Email Designs of 2026 — from The Email Marketing Bible. - [Building Your List](https://billionverify.com/email-marketing-bible/building-your-list.md): Building Your List — from The Email Marketing Bible. - [Choosing Your Platform](https://billionverify.com/email-marketing-bible/choosing-your-platform.md): Choosing Your Platform — from The Email Marketing Bible. - [Cold Email and B2B Outbound](https://billionverify.com/email-marketing-bible/cold-email-and-b2b-outbound.md): Cold Email and B2B Outbound — from The Email Marketing Bible. - [Company Case Studies](https://billionverify.com/email-marketing-bible/company-case-studies.md): Company Case Studies — from The Email Marketing Bible. - [Compliance and Privacy](https://billionverify.com/email-marketing-bible/compliance-and-privacy.md): Compliance and Privacy — from The Email Marketing Bible. - [Copywriting That Converts](https://billionverify.com/email-marketing-bible/copywriting-that-converts.md): Copywriting That Converts — from The Email Marketing Bible. - [Deliverability](https://billionverify.com/email-marketing-bible/deliverability.md): Deliverability — from The Email Marketing Bible. - [Design and Technical](https://billionverify.com/email-marketing-bible/design-and-technical.md): Design and Technical — from The Email Marketing Bible. - [Expert Directory](https://billionverify.com/email-marketing-bible/expert-directory.md): Expert Directory — from The Email Marketing Bible. - [The Fundamentals](https://billionverify.com/email-marketing-bible/fundamentals.md): The Fundamentals — from The Email Marketing Bible. - [Industry Playbooks](https://billionverify.com/email-marketing-bible/industry-playbooks.md): Industry Playbooks — from The Email Marketing Bible. - [Segmentation and Personalisation](https://billionverify.com/email-marketing-bible/segmentation-and-personalisation.md): Segmentation and Personalisation — from The Email Marketing Bible. - [Testing and Optimisation](https://billionverify.com/email-marketing-bible/testing-and-optimisation.md): Testing and Optimisation — from The Email Marketing Bible. - [The Emails That Make Money](https://billionverify.com/email-marketing-bible/the-emails-that-make-money.md): The Emails That Make Money — from The Email Marketing Bible. - [2026 Email Verification Benchmark Report](https://billionverify.com/benchmark.md): An email verification benchmark across 20 providers: accuracy, speed, pricing, and AI integration, all measured on one fixed corpus. ### Resources - [About BillionVerify: Email Verification Service](https://billionverify.com/about.md): BillionVerify is an email verification service with live SMTP checks, bulk list cleaning, an API and an MCP server. What it does, pricing, key facts, FAQs. - [BillionVerify: Email Verification Blog](https://billionverify.com/blog.md): Email checker tips and email verification guides. Deliverability best practices. Free email checker from BillionVerify. - [Email Verification](https://billionverify.com/blog/category/email-verification.md) - [Email Marketing](https://billionverify.com/blog/category/email-marketing.md) - [Email Deliverability](https://billionverify.com/blog/category/email-deliverability.md) - [Cold Email](https://billionverify.com/blog/category/cold-email.md) - [Email Compliance](https://billionverify.com/blog/category/email-compliance.md) - [Developer Guide](https://billionverify.com/blog/category/developer-guide.md) - [Documentation](https://billionverify.com/docs.md): Email checker and email verification API documentation. Quickstart guide, API reference, SDKs for Python, Node.js, Go. - [Product](https://billionverify.com/docs/product.md): Email checker and email verification product overview. Features, how it works, verification types explained. - [Overview](https://billionverify.com/docs/product/overview.md): What is email checker and email verification? Product overview, use cases, and benefits for businesses. - [Features](https://billionverify.com/docs/product/features.md): Email checker features: bulk verification, real-time API, disposable detection, catch-all detection, 99.9% accuracy. - [How It Works](https://billionverify.com/docs/product/how-it-works.md): How email checker validates addresses: syntax check, domain verification, MX records, SMTP validation explained. - [Verification Types](https://billionverify.com/docs/product/verification-types.md): Email checker result types: valid, invalid, disposable, role-based, catch-all, risky, and unknown emails explained. - [Quickstart](https://billionverify.com/docs/quickstart.md): Get started with email verification API in 5 minutes. Free API key, code examples, and email verification integration guide. - [API Reference](https://billionverify.com/docs/api-reference.md): Complete BillionVerify API reference for authentication, email verification, file jobs, downloads, credits, and webhooks. - [Verification Reasons](https://billionverify.com/docs/verification-reasons.md): Complete reference for all verification reason codes returned by BillionVerify API — what each reason means and how to act on it. - [SDKs](https://billionverify.com/docs/sdks.md): Email checker SDKs for Python, Node.js, TypeScript, Go, Java, PHP. Easy email verification integration. - [Node.js SDK](https://billionverify.com/docs/sdks/node.md): Node.js email checker SDK. Install, configure, verify emails with JavaScript. Code examples included. - [Python SDK](https://billionverify.com/docs/sdks/python.md): Python email checker SDK. pip install, verify emails with Python. Code examples and async support. - [TypeScript SDK](https://billionverify.com/docs/sdks/typescript.md): TypeScript email checker SDK with full type definitions. Type-safe email verification for Node.js. - [Go SDK](https://billionverify.com/docs/sdks/golang.md): Go email checker SDK. Install, configure, verify emails with Golang. Code examples included. - [PHP SDK](https://billionverify.com/docs/sdks/php.md): PHP email checker SDK. Composer install, verify emails with PHP. Code examples included. - [Java SDK](https://billionverify.com/docs/sdks/java.md): Java email checker SDK. Maven/Gradle setup, verify emails with Java. Code examples included. - [AI Guides](https://billionverify.com/docs/ai-guides.md): Email checker for AI agents. MCP Server, Claude Code, AI SDKs integration. Automated email verification. - [MCP Server](https://billionverify.com/docs/ai-guides/mcp.md): Connect BillionVerify's OAuth-protected MCP server to ChatGPT and other MCP-compatible AI clients. - [AI SDKs](https://billionverify.com/docs/ai-guides/ai-sdks.md): Email checker integration with AI SDKs. Anthropic, OpenAI, LangChain, Vercel AI SDK guides. - [Vercel AI SDK](https://billionverify.com/docs/ai-guides/ai-sdks/vercel-ai-sdk.md): Email checker with Vercel AI SDK. Verify emails in Next.js AI applications. - [LangChain](https://billionverify.com/docs/ai-guides/ai-sdks/langchain.md): Email checker with LangChain. Verify emails in LangChain agents and chains. - [OpenAI](https://billionverify.com/docs/ai-guides/ai-sdks/openai.md): Email checker with OpenAI SDK. Verify emails using GPT function calling. - [Anthropic Claude](https://billionverify.com/docs/ai-guides/ai-sdks/anthropic.md): Email checker with Anthropic Claude SDK. Verify emails using Claude AI tool calling. - [Agent Skills](https://billionverify.com/docs/ai-guides/agent-skills.md): Email checker agent skills for AI. Verify emails in AI workflows and automation pipelines. - [CLI Tools](https://billionverify.com/docs/ai-guides/cli-tools.md): Email checker for CLI tools. Claude Code, Codex, Gemini CLI integration guides. - [Claude Code](https://billionverify.com/docs/ai-guides/cli-tools/claude-code.md): Email checker with Claude Code. MCP Server setup for email verification in Claude. - [Gemini CLI](https://billionverify.com/docs/ai-guides/cli-tools/gemini-cli.md): Email checker with Google Gemini CLI. Verify emails in Gemini automation. - [Codex](https://billionverify.com/docs/ai-guides/cli-tools/codex.md): Email checker with OpenAI Codex CLI. Verify emails in Codex automation. - [OpenCode](https://billionverify.com/docs/ai-guides/cli-tools/opencode.md): Email checker with OpenCode CLI. Verify emails in OpenCode AI assistant. - [Droid](https://billionverify.com/docs/ai-guides/cli-tools/droid.md): Email checker with Droid CLI. Verify emails in Droid AI assistant. - [Integration Guides](https://billionverify.com/docs/integration-guides.md): Email checker integration guides. Connect email verification with web frameworks, CRMs, e-commerce, and automation tools. - [Web Frameworks](https://billionverify.com/docs/integration-guides/web-frameworks.md): Email checker for web frameworks. React, Next.js, Vue, Django, Laravel, Go integration guides. - [React](https://billionverify.com/docs/integration-guides/web-frameworks/react.md): Email checker for React. Real-time email verification in React forms and components. - [Next.js](https://billionverify.com/docs/integration-guides/web-frameworks/nextjs.md): Email checker for Next.js. Server-side and client-side email verification in React. - [Vue.js](https://billionverify.com/docs/integration-guides/web-frameworks/vue.md): Email checker for Vue.js. Real-time email verification in Vue components and forms. - [Laravel](https://billionverify.com/docs/integration-guides/web-frameworks/laravel.md): Email checker for Laravel. PHP email verification in Laravel controllers and forms. - [Django](https://billionverify.com/docs/integration-guides/web-frameworks/django.md): Email checker for Django. Python email verification in Django views and forms. - [FastAPI](https://billionverify.com/docs/integration-guides/web-frameworks/fastapi.md): Email checker for FastAPI. Python email verification in FastAPI endpoints. - [Gin](https://billionverify.com/docs/integration-guides/web-frameworks/gin.md): Email checker for Go Gin. Email verification in Gin HTTP handlers. - [Fiber](https://billionverify.com/docs/integration-guides/web-frameworks/fiber.md): Email checker for Go Fiber. Email verification in Fiber HTTP handlers. - [E-commerce](https://billionverify.com/docs/integration-guides/ecommerce.md): Email checker for e-commerce. Shopify, WooCommerce, Magento email verification integration. - [Shopify](https://billionverify.com/docs/integration-guides/ecommerce/shopify.md): Email checker for Shopify. Verify customer emails at checkout and in Shopify apps. - [WooCommerce](https://billionverify.com/docs/integration-guides/ecommerce/woocommerce.md): Email checker for WooCommerce. Verify emails at checkout and in WordPress forms. - [Magento](https://billionverify.com/docs/integration-guides/ecommerce/magento.md): Email checker for Magento. Verify customer emails in Magento 2 checkout flow. - [BigCommerce](https://billionverify.com/docs/integration-guides/ecommerce/bigcommerce.md): Email checker for BigCommerce. Verify customer emails at checkout and registration. - [Marketing & CRM](https://billionverify.com/docs/integration-guides/marketing-crm.md): Email checker for CRM platforms. HubSpot, Mailchimp, ActiveCampaign email verification. - [HubSpot](https://billionverify.com/docs/integration-guides/marketing-crm/hubspot.md): Email checker for HubSpot. Verify contacts and clean email lists in HubSpot CRM. - [ActiveCampaign](https://billionverify.com/docs/integration-guides/marketing-crm/activecampaign.md): Email checker for ActiveCampaign. Verify contacts in your email marketing automation. - [Mailchimp](https://billionverify.com/docs/integration-guides/marketing-crm/mailchimp.md): Email checker for Mailchimp. Clean your email list before sending campaigns. - [Form Builders](https://billionverify.com/docs/integration-guides/form-builders.md): Email checker for form builders. Google Forms, Typeform, Jotform email verification integration. - [Typeform](https://billionverify.com/docs/integration-guides/form-builders/typeform.md): Email checker for Typeform. Verify emails in Typeform responses and integrations. - [Google Forms](https://billionverify.com/docs/integration-guides/form-builders/google-forms.md): Email checker for Google Forms. Verify submitted emails with Apps Script integration. - [Jotform](https://billionverify.com/docs/integration-guides/form-builders/jotform.md): Email checker for Jotform. Verify emails in Jotform submissions and workflows. - [CMS Platforms](https://billionverify.com/docs/integration-guides/cms-platforms.md): Email checker for CMS platforms. WordPress, Drupal email verification integration guides. - [WordPress](https://billionverify.com/docs/integration-guides/cms-platforms/wordpress.md): Email checker for WordPress. Verify emails in contact forms, WooCommerce, and user registration. - [Automation](https://billionverify.com/docs/integration-guides/automation.md): Automate email checker with Zapier, Make, and workflow tools. No-code email verification integration. - [Zapier](https://billionverify.com/docs/integration-guides/automation/zapier.md): Email checker with Zapier. Automate email verification in Zapier workflows. No-code integration guide. - [BillionVerify: Email Verification FAQ](https://billionverify.com/faq.md): Email checker and email verification FAQ. Free email checker, API, bulk email verification questions answered. Free email checker from BillionVerify. - [Contact BillionVerify](https://billionverify.com/contact.md): Send BillionVerify a question about verification results, billing, integrations, or your account. - [BillionVerify Help center](https://billionverify.com/help.md): Clear answers about verification results, billing, credits, privacy, and provider-specific limitations. - [What do the verification statuses mean? (valid, invalid, catch-all, unknown, disposable, role)](https://billionverify.com/help/verification-statuses-overview.md): Understand valid, invalid, catch-all, unknown, disposable, and role results, including which outcomes use credits. - [Why are iCloud (icloud.com / me.com / mac.com) addresses not marked "valid"?](https://billionverify.com/help/icloud-not-marked-valid.md): Learn why iCloud, me.com, mac.com, and Hide My Email addresses return unknown instead of valid. - [Why are Outlook / Hotmail / Live addresses not marked "valid"?](https://billionverify.com/help/outlook-hotmail-not-marked-valid.md): Learn why personal Microsoft addresses return unknown and how Microsoft 365 business domains differ. - [What does an "unknown" result mean, and what should I do with it?](https://billionverify.com/help/what-does-unknown-status-mean.md): Unknown means the receiving mail system did not provide a reliable answer; it does not mean the address is bad. - [Why is an address marked catch-all instead of valid?](https://billionverify.com/help/what-does-catch-all-mean.md): Catch-all means the domain accepts every recipient without confirming whether the specific mailbox exists. - [Why was an address I believe is active marked "invalid"?](https://billionverify.com/help/email-marked-invalid-but-active.md): Invalid is based on a concrete rejection from the receiving server, not a guess about the mailbox. - [What does the "score" in the result mean?](https://billionverify.com/help/what-does-the-score-mean.md): The 0.0–1.0 score reflects deliverability confidence and should always be read together with the status. - [Why did my result change when I re-verified the same address?](https://billionverify.com/help/result-changed-on-recheck.md): Cached results and temporary mail-server conditions can explain why a later verification returns a different status. - [Which results consume credits?](https://billionverify.com/help/which-results-are-charged.md): See which verification outcomes cost one credit and which results are always returned free of charge. - [Do you charge for disposable / temporary email addresses?](https://billionverify.com/help/disposable-emails-are-free.md): Disposable-domain detection is free unless you explicitly request and complete a full live SMTP verification. - [Am I charged again if I verify the same address twice?](https://billionverify.com/help/no-charge-for-recheck-within-24h.md): Repeat checks for the same account and address are free within 24 hours unless you request a force refresh. - [Do my credits expire?](https://billionverify.com/help/do-credits-expire.md): Purchased and bonus credits stay in your account until you use them, with no monthly reset or expiration date. - [Does verification send a real email to the address?](https://billionverify.com/help/do-you-send-real-emails.md): Verification checks the receiving mail server but stops before transmitting any message body to the recipient. ### Partners - [BillionVerify Partners: AI Agent & Automation Tools](https://billionverify.com/partners.md): The BillionVerify partner directory: AI agent partners Potto AI, Markitdown AI, MapLeads and DoMyWork, plus BioPharmSignal and Integrately. ### More pages - [Active Email Checker — Is the Mailbox Still Used?](https://billionverify.com/active-email-checker.md): A free active email checker: find out whether a mailbox is still accepting mail with a live SMTP probe. Check if email active in under 2 seconds, free. - [Check Email Address Online — Free & Instant](https://billionverify.com/check-email-address.md): Check email address online in under 2 seconds: syntax, domain, MX records, and a live SMTP mailbox check. 99.9% accuracy, 600 free credits monthly. - [Does This Email Exist? Free Instant Check](https://billionverify.com/does-this-email-exist.md): Does this email exist? Ask the receiving server directly with a live SMTP mailbox probe and get an answer in under 2 seconds. Free, no credit card. - [Free Email Validation API — Real-Time SMTP Checks](https://billionverify.com/email-validation-api.md): Email validation API with 99.9% SMTP accuracy. A real-time email validation API with one endpoint, structured JSON, and native MCP integration. - [Free Fake Email Checker — Detect Fake Addresses](https://billionverify.com/fake-email-checker.md): A free fake email checker that detects fake and throwaway addresses with a live SMTP probe, not a format guess. Fake email checker online, free, no credit card. - [Free Email Tools for Verification and DNS](https://billionverify.com/free-email-tools.md): Nineteen free email tools in four groups: free email verification tools, DNS and authentication checkers, message diagnostics, and list utilities. No signup. - [Is This Email Legit? Free Sender Address Check](https://billionverify.com/is-this-email-legit.md): Is this email address legit? Check whether a real mailbox is behind the sender address in under 2 seconds with a live SMTP probe. Free, no credit card. - [Is This Email Real? Free Instant Check](https://billionverify.com/is-this-email-real.md): Is this email address real? Get a straight answer in under 2 seconds from a live SMTP mailbox check — not a format guess. Free, no credit card. - [Is This Email Valid? Free Instant Check](https://billionverify.com/is-this-email-valid.md): Is this email valid? Get a straight answer in under 2 seconds with a real SMTP mailbox check — syntax, domain, MX, and risk flags. Free, no credit card. - [Verify Email Address Online — Free SMTP Verify](https://billionverify.com/verify-email-address.md): Verify email address online with a real SMTP mailbox verify in under 2 seconds. Stop hard bounces before you send. 99.9% accuracy, 600 free credits monthly. ## Discovery - [llms.txt](https://billionverify.com/llms.txt): Short index of this site. - [Sitemap index](https://billionverify.com/sitemap.xml) - [Marketing pages sitemap](https://billionverify.com/sitemap-static.xml) - [Integrations sitemap](https://billionverify.com/sitemap-integrations.xml) - [Blog sitemap](https://billionverify.com/sitemap-blog.xml) - [Blog categories sitemap](https://billionverify.com/sitemap-categories.xml) - [Glossary sitemap](https://billionverify.com/sitemap-glossary.xml) - [Guides sitemap](https://billionverify.com/sitemap-guides.xml) - [Help center sitemap](https://billionverify.com/sitemap-help.xml) - [Docs sitemap](https://billionverify.com/sitemap-docs.xml) - [Robots](https://billionverify.com/robots.txt)