Close handles sequences and CRM together. Bad records damage both.
Close is a CRM built specifically for outbound sales teams — it combines contact management, calling, and email sequencing in a single interface. That unified model is efficient, but it introduces a compounding risk: a bad email record does not just affect one campaign. It sits in the CRM and can be enrolled in future sequences, imported into other tools, and counted in pipeline data until someone actively removes it.
When a contact bounces in Close, the damage is double. The sending domain takes a reputation hit, and the CRM contact record is now a piece of dirty data that requires cleanup. Sales teams using Close often do not separate their "CRM hygiene" work from their "sending health" work — they are the same problem.
Verifying before a sequence runs in Close is not just about protecting deliverability. It is about keeping the contact database accurate from the moment records enter it.
Cold Email Verification Framework
This page covers one sender or workflow. The full framework explains the complete path from list source through verification, segmentation, and import into your sender.
What to check before Close sequences run.
Close contacts come from multiple sources — manual entry, CSV import, CRM migration, lead enrichment, and API integrations. Each source carries a different risk profile. Before any contact enters a sequence, these fields should be checked.
| Field | Why it matters |
|---|---|
| The address that enters the sequence — needs to be valid and deliverable | |
| Domain | Determines catch-all status, MX validity, and whether the company domain is active |
| Source | CSV import, API sync, manual entry, migration from another CRM — staleness varies by origin |
| Suppression status | Prior bounces and opt-outs should be flagged before sequence enrollment |
| List age | Contacts added to Close more than 90 days ago should be re-verified before sequence enrollment |
The risk each signal type creates.
Sequence enrollment in Close is often driven by Smart Views or filtered contact lists. Understanding what each signal type does to your campaigns helps you build the right filtering rules before enrollment.
| Signal | Delivery behavior | Risk to Close sequences |
|---|---|---|
| Invalid | Permanently rejected | Hard bounce — reputation damage to your sending domain |
| Catch-all | Domain accepts all addresses, mailbox uncertain | Uncertain delivery — inflates bounce risk and distorts sequence performance |
| Role-based | Shared inbox (info@, sales@, hello@) | Low engagement, potential complaints, not a named individual contact |
| Disposable | Temporary or low-trust address | Not a real business contact — remove before import |
| Unknown | Verification result inconclusive | Exclude from sequences until resolved through manual review |
| Duplicate | Same address enrolled across multiple sequences | Repeat sends, increased complaint exposure, distorted activity data |
Verify before import — not after bounce.
The right moment to verify is before contacts are imported into Close and before any sequence is activated. Once contacts are in an active sequence, removing them requires manual intervention mid-campaign. The bounce has likely already occurred.
Collect list from source
→ Normalize and deduplicate
→ Verify with BillionVerify
→ Apply routing decisions by signal
→ Import approved records into Close CRM
→ Enroll verified contacts into Close sequences
CRM migrations deserve special attention. Moving contact data from one CRM to Close often surfaces contacts that were never verified, have been inactive for years, or were added through a data source that no longer reflects current email status. Verify before the migration completes, not after the first sequence runs.
Route each result before Close sees it.
| BillionVerify result | Action |
|---|---|
| Valid | Import into Close and enroll in target sequence |
| Invalid | Do not import — add to global suppression list |
| Catch-all | Separate sequence with lower volume and closer monitoring |
| Role-based | Separate sequence with shared-inbox appropriate messaging |
| Unknown | Hold for manual review — do not enroll in active sequences |
| Risky or disposable | Do not import |
Maintain a suppression file that spans all your Close sequences. Addresses that bounce or opt out from one sequence should not re-enter through a different import or a new sequence enrollment. Close does not automatically prevent a contact from entering a new sequence if the contact record still exists.
After the list is verified.
Once verified contacts are in Close:
- Valid contacts enroll in your primary sequences at standard cadence
- Catch-all contacts run in a lower-volume, separately monitored sequence
- Role-based contacts get messaging that fits a shared or team inbox context
- Invalid and risky contacts are suppressed and excluded from all future sequence enrollments
- Unknown contacts sit in a review queue before any sequence decision
The CRM record for suppressed addresses should be updated to reflect their status. That prevents the same address from being re-enrolled when a new sequence is created or a Smart View filter is applied without a suppression check.
Other senders with similar pre-import decisions.
Instantly Email Verification
Verify before importing lists into Instantly campaigns and warmup sequences.
GMass Email Verification
Clean Google Sheets lists before GMass sends them through Gmail.
Smartlead Email Verification
Set a pre-import quality gate for high-volume Smartlead campaigns.
Lemlist Email Verification
Verify lists before multi-channel Lemlist campaigns — before enrichment becomes a liability.
Salesloft Email Verification
Apply a pre-import quality gate before records enter Salesloft sequences.
Outreach Email Verification
Verify emails before Outreach sequence enrollment to protect enterprise sender reputation.
Mailshake Email Verification
Clean lists before Mailshake campaigns — keep bounce rate low for small outbound teams.
Reply.io Email Verification
Verify emails before Reply.io sequences to prevent invalid records from entering automated workflows.
Mailmeteor Email Verification
Check Google Sheets contacts before Mailmeteor sends Gmail merge campaigns.
QuickMail Email Verification
Apply a pre-import quality gate before contacts enter QuickMail inboxes.
Saleshandy Email Verification
Verify lists before Saleshandy campaigns to protect deliverability at lower send budgets.
Woodpecker Email Verification
Set a pre-import verification step for Woodpecker campaigns and agency clients.
Klenty Email Verification
Verify emails before Klenty cadences to keep CRM-sourced contacts clean.
Yesware Email Verification
Verify lists before Gmail-based Yesware campaigns to reduce bounce exposure.
Overloop Email Verification
Apply a pre-send quality gate before contacts enter Overloop sequences.
Mixmax Email Verification
Verify emails before Mixmax Gmail sequences to prevent bounce damage.
Lavender + BillionVerify Workflow
Verify the list before Lavender helps write messages — clean data improves AI targeting.
PersistIQ Email Verification
Check lists before PersistIQ campaigns to keep SDR workflows free of invalid contacts.
Autoklose Email Verification
Verify emails before Autoklose sequences — protect automated sending from list risk.
SendBuzz Email Verification
Apply a pre-import gate before SendBuzz campaigns to keep bounce rate low at scale.
Close CRM email verification common questions.
1. Does Close verify email addresses before sequence enrollment?
Close does not apply a dedicated external verification step before contacts enter sequences. Sequence enrollment is based on contact attributes and Smart View filters, not on a pre-send deliverability check. BillionVerify adds that quality gate before contacts are imported.
2. I have thousands of contacts already in Close. Do I need to verify them?
Any contacts you plan to enroll in a sequence should be verified first — especially contacts that were added more than 90 days ago or came from a CRM migration. Contacts sitting in Close without recent activity are at the highest risk of being stale.
3. How does the CRM model in Close change the verification approach?
Because Close is both a CRM and a sender, contact data problems compound. A bounced send creates a low-quality contact record and a reputation hit at the same time. Verification before import protects both — you are not just protecting deliverability, you are protecting the integrity of the contact database.
4. What happens when a contact bounces in Close?
A bounce in Close damages your sending domain's reputation and leaves a record in your CRM that may be re-enrolled in future sequences. You should mark bounced contacts as suppressed, update the contact record, and exclude that address from all future sequence enrollments. Verification before import prevents most of these situations from occurring in the first place.
5. Should I verify contacts before a CRM migration into Close?
Yes. CRM migrations bring in whatever the source system contains — including contacts added years ago, invalid addresses, duplicates, and records from previous owners. Verify the export before importing it into Close, not after the migration is complete and sequences are already running.