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Slack email verification with BillionVerify
Slack is the team communication hub used by millions of organizations. When email addresses surface in Slack — through onboarding bots, form submissions piped to channels, or slash commands — verifying them with BillionVerify before they reach your mailing lists or CRM prevents bounces from entering your systems through an unconventional back door.
Why verify before the send
Teams often share or collect email addresses informally through Slack workflows and bots. These addresses bypass the usual validation checkpoints and land directly in spreadsheets or CRMs. BillionVerify adds a verification step so every email that flows out of Slack into an external tool is confirmed deliverable before it causes bounce damage.
Ready-to-use n8n workflow
Import this workflow into n8n — it verifies every address with BillionVerify before Slack sends, so only deliverable contacts are emailed. Install the BillionVerify community node first, then add your API key. Adapted from this n8n template
verify-emails-in-slack.json
{
"name": "Form to meeting: Google Calendar, Zoom, Gmail & Slack booking automation + BillionVerify",
"nodes": [
{
"id": "3dd27b86-6e03-4595-a9fa-2fe3d1210611",
"name": "Google Forms Webhook1",
"type": "n8n-nodes-base.webhook",
"position": [
176,
208
],
"webhookId": "0c79affb-61ad-4802-8580-66c5856d66cf",
"parameters": {
"path": "google-forms-booking",
"options": {},
"httpMethod": "POST",
"responseMode": "lastNode"
},
"typeVersion": 2.1
},
{
"id": "957b6711-281f-4599-9962-84ebf221691a",
"name": "Merge Form Data1",
"type": "n8n-nodes-base.merge",
"position": [
496,
224
],
"parameters": {},
"typeVersion": 3.2
},
{
"id": "3b63fe73-a5e7-4f3e-bf61-e7bd0a9aa63c",
"name": "Workflow Configuration1",
"type": "n8n-nodes-base.set",
"position": [
848,
224
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "id-1",
"name": "calendarId",
"type": "string",
"value": "user@example.com"
},
{
"id": "id-2",
"name": "slackChannel",
"type": "string",
"value": "C09GN4NCTAP"
},
{
"id": "id-3",
"name": "teammateEmail",
"type": "string",
"value": "user@example.com"
}
]
},
"includeOtherFields": true
},
"typeVersion": 3.4
},
{
"id": "66b2895b-8260-4e40-b4ec-39b100b89f77",
"name": "Extract Booking Details1",
"type": "n8n-nodes-base.set",
"position": [
1168,
224
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "id-1",
"name": "customerName",
"type": "string",
"value": "={{ $json.body.name }}"
},
{
"id": "id-2",
"name": "customerEmail",
"type": "string",
"value": "={{ $json.body.email }}"
},
{
"id": "id-3",
"name": "bookingDate",
"type": "string",
"value": "={{ $json.body.date }}"
},
{
"id": "id-4",
"name": "bookingTime",
"type": "string",
"value": "={{ $json.body.time }}"
},
{
"id": "34865dea-9db2-4f35-b91b-322572680869",
"name": "bookingStartISO",
"type": "string",
"value": "={{ new Date($json.body.date + 'T' + $json.body.time + ':00+09:00').toISOString() }}"
},
{
"id": "941d5f18-54fd-41ad-8f46-c9f9f13fb32f",
"name": "bookingEndISO",
"type": "string",
"value": "={{ new Date(new Date($json.body.date + 'T' + $json.body.time + ':00+09:00').getTime() + 60*60*1000).toISOString() }}"
}
]
},
"includeOtherFields": true
},
"typeVersion": 3.4
},
{
"id": "6591a8f7-2400-4de8-9fbe-b35271faf1f8",
"name": "Check Calendar Availability1",
"type": "n8n-nodes-base.googleCalendar",
"position": [
1472,
224
],
"parameters": {
"options": {},
"timeMax": "={{ $json.bookingEndISO }}",
"timeMin": "={{ $json.bookingStartISO }}",
"calendar": {
"__rl": true,
"mode": "id",
"value": "={{ $('Workflow Configuration1').first().json.calendarId }}"
},
"operation": "getAll"
},
"typeVersion": 1.3,
"alwaysOutputData": true
},
{
"id": "d80641b0-9da6-491c-922f-d278c0f030c3",
"name": "Is Time Slot Available?1",
"type": "n8n-nodes-base.if",
"position": [
1824,
224
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "14e9293a-f96c-45f1-b216-2c8aaf2fb3e2",
"operator": {
"type": "object",
"operation": "empty",
"singleValue": true
},
"leftValue": "={{ $json }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.2
},
{
"id": "76a27cb5-7196-4564-a89a-85d5d0a41d52",
"name": "Create Calendar Event1",
"type": "n8n-nodes-base.googleCalendar",
"position": [
2144,
208
],
"parameters": {
"end": "={{ $('Extract Booking Details1').first().json.bookingEndISO }}",
"start": "={{ $('Extract Booking Details1').first().json.bookingStartISO }}",
"calendar": {
"__rl": true,
"mode": "id",
"value": "={{ $('Workflow Configuration1').first().json.calendarId }}"
},
"additionalFields": {
"summary": "=Booking with {{ $('Extract Booking Details1').first().json.customerName }}",
"attendees": [
"={{ $('Extract Booking Details1').first().json.customerEmail }}"
],
"description": "=Customer: {{ $('Extract Booking Details1').first().json.customerName }} ({{ $('Extract Booking Details1').first().json.customerEmail }})"
}
},
"typeVersion": 1.3
},
{
"id": "9f4ca36f-8f02-43ee-8630-222958201959",
"name": "Create Zoom Meeting1",
"type": "n8n-nodes-base.zoom",
"position": [
2416,
208
],
"parameters": {
"topic": "=Booking with {{ $('Extract Booking Details1').first().json.customerName }}",
"authentication": "oAuth2",
"additionalFields": {
"duration": 60,
"timeZone": "UTC",
"startTime": "={{ $('Extract Booking Details1').first().json.bookingStartISO }}"
}
},
"typeVersion": 1
},
{
"id": "a31d67fa-38b4-4276-a0ad-56d1069f95dd",
"name": "Send Confirmation Email1",
"type": "n8n-nodes-base.gmail",
"position": [
2720,
208
],
"webhookId": "f28b9459-360b-4cad-9f2e-0d69654e795b",
"parameters": {
"sendTo": "={{ $('Extract Booking Details1').first().json.customerEmail }}",
"message": "=Hi {{ $('Extract Booking Details1').first().json.customerName }},\n\nYour booking has been confirmed!\n\nDate & Time: {{ new Date($('Extract Booking Details1').first().json.bookingStartISO).toLocaleString('ja-JP', { timeZone: 'Asia/Tokyo' }) }}\n\nZoom Meeting Link: {{ $json.join_url }}\n\nLooking forward to meeting you!\n\nBest regards",
"options": {},
"subject": "=Booking Confirmed: {{ new Date($('Extract Booking Details1').first().json.bookingStartISO).toLocaleString('ja-JP', { timeZone: 'Asia/Tokyo' }) }}"
},
"typeVersion": 2.1
},
{
"id": "b456c4f9-dcca-48a4-b750-f39e95df493f",
"name": "Notify Teammate on Slack1",
"type": "n8n-nodes-base.slack",
"position": [
3040,
208
],
"webhookId": "866a3241-98d2-4db1-b791-c8c8f83b99b9",
"parameters": {
"text": "=🎉 New booking confirmed!\n\n*Customer:* {{ $('Extract Booking Details1').first().json.customerName }} ({{ $('Extract Booking Details1').first().json.customerEmail }})\n*Date & Time:* {{ new Date($('Extract Booking Details1').first().json.bookingStartISO).toLocaleString('ja-JP', { timeZone: 'Asia/Tokyo' }) }}\n*Zoom Link:* {{ $json.join_url }}",
"select": "channel",
"channelId": {
"__rl": true,
"mode": "id",
"value": "={{ $('Workflow Configuration1').first().json.slackChannel }}"
},
"otherOptions": {},
"authentication": "oAuth2"
},
"typeVersion": 2.3
},
{
"id": "78d4ae92-b136-4bbe-ae52-a73a60c47a6c",
"name": "Send Unavailable Email1",
"type": "n8n-nodes-base.gmail",
"position": [
2144,
512
],
"webhookId": "98dd0319-284e-4b12-a655-a57577571800",
"parameters": {
"sendTo": "={{ $('Extract Booking Details1').first().json.customerEmail }}",
"message": "=Hi {{ $('Extract Booking Details1').first().json.customerName }},\n\nThank you for your booking request. Unfortunately, the requested time slot on {{ new Date($('Extract Booking Details1').first().json.bookingStartISO).toLocaleString('ja-JP', { timeZone: 'Asia/Tokyo' }) }} is not available.\n\nPlease submit a new booking request with an alternative time.",
"options": {},
"subject": "Time Slot Unavailable"
},
"typeVersion": 2.1
},
{
"id": "9f8af7ba-09f1-46bb-9bc6-bb2d0b26d744",
"name": "Sticky: Google Forms Webhook1",
"type": "n8n-nodes-base.stickyNote",
"position": [
96,
-400
],
"parameters": {
"color": "white",
"width": 768,
"height": 528,
"content": "Title: Automated Booking → Calendar + Zoom + Email + Slack\nWhat this workflow does\n\nCaptures booking submissions from a form and parses date/time.\n\nChecks Google Calendar for conflicts.\n\nIf free: creates a Calendar event → creates a Zoom meeting → emails the guest → notifies your team on Slack.\n\nIf busy: emails the guest to pick another time.\n\nFlow\nWebhook → Merge → Config → Extract details → Check availability → IF (free/busy) →\n[Free] Create Calendar Event → Create Zoom → Email confirmation → Slack notify\n[Busy] Email unavailability\n\nNotes\n\nKeep all user-editable variables in the Set nodes for easy maintenance.\n\nDate handling assumes Asia/Tokyo input and converts to ISO for API calls.\n\nNo hardcoded credentials inside HTTP nodes; store secrets via Credentials."
},
"typeVersion": 1
},
{
"id": "5eb1dc05-5c0f-44a0-9000-d4abdd74a981",
"name": "Sticky: Merge Form Data1",
"type": "n8n-nodes-base.stickyNote",
"position": [
80,
384
],
"parameters": {
"color": "white",
"width": 256,
"height": 176,
"content": "Purpose: Entry point for bookings. Receives a POST payload from your form (name, email, date, time).\nOutput: Raw form fields under body.* used downstream."
},
"typeVersion": 1
},
{
"id": "967bcc58-fc07-4e4c-8b17-5f2a99f9287f",
"name": "Sticky: Workflow Configuration1",
"type": "n8n-nodes-base.stickyNote",
"position": [
400,
384
],
"parameters": {
"color": "white",
"width": 272,
"height": 176,
"content": "Purpose: Normalizes/forwards webhook data to keep a single item moving through the flow.\nTip: Use this as a “buffer” if you ever add parallel inputs later."
},
"typeVersion": 1
},
{
"id": "663ecdf9-6f9d-481c-abe6-e7d8b3c34021",
"name": "Sticky: Extract Booking Details1",
"type": "n8n-nodes-base.stickyNote",
"position": [
736,
384
],
"parameters": {
"color": "white",
"width": 288,
"height": 176,
"content": "Purpose: Central place for editable constants (e.g., calendarId, slackChannel, teammateEmail).\nWhy: Makes the template plug-and-play—update values here instead of hunting through nodes."
},
"typeVersion": 1
},
{
"id": "c12bee38-9494-43b7-9961-2e4971a92316",
"name": "Sticky: Check Calendar Availability1",
"type": "n8n-nodes-base.stickyNote",
"position": [
1088,
384
],
"parameters": {
"color": "white",
"width": 272,
"height": 176,
"content": "Purpose: Maps form fields to clean variables: customerName, customerEmail, bookingDate, bookingTime.\nAlso: Builds bookingStartISO and bookingEndISO (60-min duration) using the submitted local time (JST) → ISO strings."
},
"typeVersion": 1
},
{
"id": "b58f33ab-ad60-4a98-9354-3ed1a1aeab72",
"name": "Sticky: Is Time Slot Available?1",
"type": "n8n-nodes-base.stickyNote",
"position": [
1424,
384
],
"parameters": {
"color": "white",
"width": 256,
"height": 176,
"content": "Purpose: Queries the target calendar for events overlapping bookingStartISO–bookingEndISO.\nBehavior: Returns an empty list when the slot is free; non-empty when it’s taken."
},
"typeVersion": 1
},
{
"id": "b0b7376c-f552-4ce9-bd31-33919ba04618",
"name": "Sticky: Create Calendar Event1",
"type": "n8n-nodes-base.stickyNote",
"position": [
1744,
384
],
"parameters": {
"color": "white",
"width": 256,
"height": 176,
"content": "Purpose: Branches on availability.\nTrue (empty result): Slot is free → proceed to create the event.\nFalse (has events): Slot is busy → send “unavailable” email."
},
"typeVersion": 1
},
{
"id": "bb03b52c-ddc4-4896-9016-6d01ab6b68ec",
"name": "Sticky: Create Zoom Meeting1",
"type": "n8n-nodes-base.stickyNote",
"position": [
2000,
16
],
"parameters": {
"color": "white",
"width": 272,
"content": "Purpose: Books the time on Google Calendar with the guest as an attendee.\nFields: Summary includes guest name; Description includes name + email for quick context."
},
"typeVersion": 1
},
{
"id": "73736740-501f-4814-9722-e8576e2dd21f",
"name": "Sticky: Send Confirmation Email1",
"type": "n8n-nodes-base.stickyNote",
"position": [
2336,
16
],
"parameters": {
"color": "white",
"content": "Purpose: Creates a Zoom meeting for the confirmed slot.\nTiming: Uses the booking start time and a 60-minute duration.\nOutput: Provides join_url used by Email/Slack steps."
},
"typeVersion": 1
},
{
"id": "6e9c22c3-0b31-47f9-ab96-4476e501175d",
"name": "Sticky: Notify Teammate on Slack1",
"type": "n8n-nodes-base.stickyNote",
"position": [
2640,
16
],
"parameters": {
"color": "white",
"width": 256,
"content": "Purpose: Sends a confirmation to the guest with local (Japan) date/time and the Zoom link.\nSubject/Body: Human-readable datetime via toLocaleString('ja-JP', { timeZone: 'Asia/Tokyo' })."
},
"typeVersion": 1
},
{
"id": "b9aa000c-63a2-44b1-800a-c041a1582f64",
"name": "Sticky: Send Unavailable Email1",
"type": "n8n-nodes-base.stickyNote",
"position": [
2064,
672
],
"parameters": {
"color": "white",
"width": 256,
"content": "Purpose: Notifies the guest when the requested slot is already taken and asks them to rebook another time."
},
"typeVersion": 1
},
{
"id": "3904238d-39eb-40f0-879f-3f17e1afd303",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
2960,
16
],
"parameters": {
"content": "Purpose: Posts a concise booking summary to your specified Slack channel.\nIncludes: Guest name/email, localized date/time, and Zoom join_url."
},
"typeVersion": 1
},
{
"parameters": {
"operation": "verify",
"email": "={{ $('Extract Booking Details1').first().json.customerEmail }}",
"additionalOptions": {}
},
"type": "n8n-nodes-billionverify.billionVerify",
"typeVersion": 1,
"position": [
2360,
208
],
"name": "Verify Email (BillionVerify)",
"credentials": {
"billionVerifyApi": {
"id": "",
"name": "BillionVerify account"
}
}
},
{
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "loose"
},
"combinator": "and",
"conditions": [
{
"id": "is-deliverable",
"leftValue": "={{ $json.is_deliverable }}",
"rightValue": "",
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
}
}
]
}
},
"type": "n8n-nodes-base.if",
"typeVersion": 2,
"position": [
2540,
208
],
"name": "IF deliverable"
},
{
"parameters": {
"operation": "verify",
"email": "={{ $('Extract Booking Details1').first().json.customerEmail }}",
"additionalOptions": {}
},
"type": "n8n-nodes-billionverify.billionVerify",
"typeVersion": 1,
"position": [
1784,
512
],
"name": "Verify Email (BillionVerify) 2",
"credentials": {
"billionVerifyApi": {
"id": "",
"name": "BillionVerify account"
}
}
},
{
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "loose"
},
"combinator": "and",
"conditions": [
{
"id": "is-deliverable",
"leftValue": "={{ $json.is_deliverable }}",
"rightValue": "",
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
}
}
]
}
},
"type": "n8n-nodes-base.if",
"typeVersion": 2,
"position": [
1964,
512
],
"name": "IF deliverable 2"
}
],
"connections": {
"Merge Form Data1": {
"main": [
[
{
"node": "Workflow Configuration1",
"type": "main",
"index": 0
}
]
]
},
"Create Zoom Meeting1": {
"main": [
[
{
"node": "Verify Email (BillionVerify)",
"type": "main",
"index": 0
}
]
]
},
"Google Forms Webhook1": {
"main": [
[
{
"node": "Merge Form Data1",
"type": "main",
"index": 0
}
]
]
},
"Create Calendar Event1": {
"main": [
[
{
"node": "Create Zoom Meeting1",
"type": "main",
"index": 0
}
]
]
},
"Workflow Configuration1": {
"main": [
[
{
"node": "Extract Booking Details1",
"type": "main",
"index": 0
}
]
]
},
"Extract Booking Details1": {
"main": [
[
{
"node": "Check Calendar Availability1",
"type": "main",
"index": 0
}
]
]
},
"Is Time Slot Available?1": {
"main": [
[
{
"node": "Create Calendar Event1",
"type": "main",
"index": 0
}
],
[
{
"node": "Verify Email (BillionVerify) 2",
"type": "main",
"index": 0
}
]
]
},
"Send Confirmation Email1": {
"main": [
[
{
"node": "Notify Teammate on Slack1",
"type": "main",
"index": 0
}
]
]
},
"Check Calendar Availability1": {
"main": [
[
{
"node": "Is Time Slot Available?1",
"type": "main",
"index": 0
}
]
]
},
"Verify Email (BillionVerify)": {
"main": [
[
{
"node": "IF deliverable",
"type": "main",
"index": 0
}
]
]
},
"IF deliverable": {
"main": [
[
{
"node": "Send Confirmation Email1",
"type": "main",
"index": 0
}
],
[]
]
},
"Verify Email (BillionVerify) 2": {
"main": [
[
{
"node": "IF deliverable 2",
"type": "main",
"index": 0
}
]
]
},
"IF deliverable 2": {
"main": [
[
{
"node": "Send Unavailable Email1",
"type": "main",
"index": 0
}
],
[]
]
}
},
"settings": {
"executionOrder": "v1"
}
}Workflow templates with Slack
Ready-to-use workflows that verify emails before Slack sends.
How it works
- 1
An email address enters Slack through a bot message, workflow step, or slash command.
- 2
An n8n or Integrately automation detects the new message or event and extracts the email.
- 3
BillionVerify's REST API validates the address for deliverability, disposable status, and role-account patterns.
- 4
The verification result is posted back to Slack or forwarded to the appropriate downstream tool.
- 5
Your team sees clean, actionable contact data without manual checking.
When to use this
Slack Bot Lead Collection
When an internal Slack bot or Workflow Builder step captures a prospect's email and routes it to your CRM or outreach tool, add a BillionVerify check to catch invalid or disposable addresses before they're saved.
Team Notifications on Verification Results
Use Slack as a notification layer: after BillionVerify processes a batch of emails from a form or signup flow, post a summary to a channel so your team sees bounced counts and quality scores at a glance.
Support Escalation via Slack
If customer emails are shared in a Slack channel for support follow-up, verify them first to ensure your team isn't chasing undeliverable addresses when reaching out.
FAQ
How does email verification fit into a Slack workflow?
You connect Slack to BillionVerify via n8n or Integrately. When an email appears in a Slack message or workflow step, the automation calls BillionVerify and returns the result — all without leaving Slack.
Can I get verification results posted directly in Slack?
Yes. Build a workflow that calls BillionVerify and then sends the result back to a Slack channel or direct message, so your team always knows whether an email is safe to use.
What kinds of addresses will BillionVerify flag?
BillionVerify identifies invalid, non-existent, disposable, role-based, and catch-all email addresses — the main categories that cause bounces and deliverability problems.
Is the Integrately integration available for Slack and BillionVerify?
Yes. Integrately offers a 1-click setup to connect Slack and BillionVerify, so you can start verifying emails that flow through Slack without writing any code.
Verify emails in Slack
Create a free account, grab your API key, and stop bounces before they happen.
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