Calendly email verification with BillionVerify
Calendly is one of the most widely used scheduling platforms for automating meeting bookings across sales, recruiting, and customer success teams. Adding BillionVerify to your Calendly workflow ensures that every invitee email — from demo requests to onboarding calls — is valid before confirmations and reminders are dispatched.
Why verify before the send
High booking volume on Calendly means a steady stream of email addresses from leads, candidates, and customers. Disposable emails, typos, and inactive inboxes generate hard bounces that hurt your sending reputation and leave booked slots unattended. BillionVerify intercepts these addresses the moment a booking is created, keeping your contact list clean and your deliverability strong.
Ready-to-use n8n workflow
Import this workflow into n8n — it verifies every address with BillionVerify before Calendly sends, so only deliverable contacts are emailed. Install the BillionVerify community node first, then add your API key. Adapted from this n8n template
{
"name": "Recover no-show appointments with Calendly, Telegram & email alerts + BillionVerify",
"nodes": [
{
"id": "1ac4eb6c-6300-4ae5-b853-314a1fd7e482",
"name": "Hourly Check Trigger",
"type": "n8n-nodes-base.cron",
"position": [
-1120,
816
],
"parameters": {
"triggerTimes": {
"item": [
{
"mode": "everyHour"
}
]
}
},
"typeVersion": 1
},
{
"id": "2a5b2876-6fda-459b-b573-fcd354958dea",
"name": "Get Active Calendly Appointments",
"type": "n8n-nodes-base.httpRequest",
"position": [
-896,
816
],
"parameters": {
"url": "https://api.calendly.com/scheduled_events?user={{$env.CALENDLY_USER_URI}}&status=active",
"options": {}
},
"typeVersion": 3
},
{
"id": "a5008069-f79b-4ba8-a55f-5f7bedf187d4",
"name": "Filter No-Show Appointments (30+ min past)",
"type": "n8n-nodes-base.function",
"position": [
-656,
816
],
"parameters": {
"functionCode": "const now = new Date();\nconst thresholdMinutes = 30;\n\nconst missed = [];\nfor (const item of items[0].json.collection) {\n const endTime = new Date(item.end_time);\n const diffMinutes = (now - endTime) / 60000;\n if (diffMinutes > thresholdMinutes && !item.attended) {\n missed.push({ json: item });\n }\n}\nreturn missed;"
},
"typeVersion": 1
},
{
"id": "a4c3136a-8697-48dc-ac99-42b126a38d29",
"name": "Check If High Intent Lead",
"type": "n8n-nodes-base.if",
"position": [
-416,
816
],
"parameters": {
"conditions": {
"string": [
{
"value1": "={{ $json.metadata ? $json.metadata.contact_tags : '' }}",
"value2": "High Intent",
"operation": "contains"
}
]
}
},
"typeVersion": 1
},
{
"id": "e9cfd82c-7632-4957-9133-a80f742f6ff0",
"name": "Send Reschedule Link via Telegram",
"type": "n8n-nodes-base.telegram",
"position": [
-176,
768
],
"webhookId": "231fb58f-bed8-4c48-89c9-a29677e46a66",
"parameters": {
"text": "Hi {{$json.invitee_name}}, we missed you on our call earlier!\\nYou can reschedule here: {{$json.uri}}\\n— Team Shoonya",
"chatId": "={{ $json.metadata ? $json.metadata.telegram_id : '' }}",
"additionalFields": {}
},
"credentials": {
"telegramApi": {
"id": "credential-id",
"name": "telegramApi Credential"
}
},
"typeVersion": 1
},
{
"id": "78f1d804-c3f8-48c5-87a0-6c15371470b1",
"name": "Alert Sales Rep via Email",
"type": "n8n-nodes-base.emailSend",
"position": [
64,
768
],
"parameters": {
"text": "The meeting with {{$json.invitee_name}} appears missed.\\nTelegram message sent successfully.\\nPlease follow up or reschedule here: {{$json.uri}}",
"options": {},
"subject": "Missed Appointment: {{$json.invitee_name}}",
"toEmail": "={{ $json.metadata ? $json.metadata.rep_email : 'sales@yourcompany.com' }}",
"fromEmail": "user@example.com"
},
"credentials": {
"smtp": {
"id": "credential-id",
"name": "smtp Credential"
}
},
"typeVersion": 1
},
{
"id": "ec4bb9a0-b81e-450e-b640-b593c8223f33",
"name": "Sticky Note - Overview",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1488,
448
],
"parameters": {
"width": 280,
"height": 268,
"content": "## 🚀 WORKFLOW START\n\n**Purpose:** Automatically detect and recover no-show appointments\n\n**Trigger:** Runs every hour to check for missed meetings\n\n**Target:** High-intent leads who didn't attend their scheduled calls"
},
"typeVersion": 1
},
{
"id": "51435d29-7443-496e-b7a2-c5eeec29509c",
"name": "Sticky Note - Fetch",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1056,
512
],
"parameters": {
"width": 280,
"height": 284,
"content": "## 📅 STEP 1: Fetch Appointments\n\n**Action:** Retrieves all active scheduled events from Calendly\n\n**API Endpoint:** Calendly scheduled_events API\n\n**Data Retrieved:** Meeting details, invitee info, attendance status, metadata"
},
"typeVersion": 1
},
{
"id": "4fe58a6e-b193-4fc7-b0c6-e83bf77521a8",
"name": "Sticky Note - Filter",
"type": "n8n-nodes-base.stickyNote",
"position": [
-736,
976
],
"parameters": {
"width": 280,
"height": 268,
"content": "## 🔍 STEP 2: Identify No-Shows\n\n**Logic:** Filters appointments where:\n- Meeting ended 30+ minutes ago\n- Attendee did NOT show up (attended = false)\n\n**Output:** List of missed appointments only"
},
"typeVersion": 1
},
{
"id": "0bf45c2b-5a96-452b-95e0-18a10ed3b56c",
"name": "Sticky Note - Condition",
"type": "n8n-nodes-base.stickyNote",
"position": [
-576,
512
],
"parameters": {
"width": 280,
"height": 268,
"content": "## 🎯 STEP 3: Priority Check\n\n**Condition:** Only proceed if contact has \"High Intent\" tag\n\n**Why:** Focus recovery efforts on qualified leads\n\n**Source:** Checks metadata.contact_tags field"
},
"typeVersion": 1
},
{
"id": "71b384d7-a800-468a-8c0d-142ebf28bd8c",
"name": "Sticky Note - Telegram",
"type": "n8n-nodes-base.stickyNote",
"position": [
-256,
960
],
"parameters": {
"width": 280,
"height": 316,
"content": "## 💬 STEP 4: Customer Outreach\n\n**Action:** Sends friendly reschedule message via Telegram\n\n**Message Includes:**\n- Personalized greeting\n- Direct reschedule link\n- Company signature\n\n**Target:** Lead's Telegram ID from metadata"
},
"typeVersion": 1
},
{
"id": "7446d041-d351-4419-8a15-bd5882e04361",
"name": "Sticky Note - Email Alert",
"type": "n8n-nodes-base.stickyNote",
"position": [
-80,
400
],
"parameters": {
"width": 280,
"height": 348,
"content": "## 📧 STEP 5: Internal Notification\n\n**Action:** Alerts assigned sales rep about the no-show\n\n**Email Contains:**\n- Customer name\n- Confirmation of Telegram message sent\n- Reschedule link for manual follow-up\n\n**Recipient:** Sales rep email from metadata"
},
"typeVersion": 1
},
{
"id": "2e2db44b-f716-4771-91ff-72f11659383a",
"name": "Sticky Note - Setup Requirements",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1472,
1056
],
"parameters": {
"width": 280,
"height": 300,
"content": "## ⚙️ REQUIRED SETUP\n\n**Environment Variables:**\n- CALENDLY_USER_URI\n\n**Credentials:**\n- Telegram API (configured)\n- SMTP/Gmail (configured)\n\n**Metadata Fields Needed:**\n- contact_tags (for \"High Intent\")\n- telegram_id\n- rep_email"
},
"typeVersion": 1
},
{
"id": "4ffa2f77-867d-4bc8-8b4b-c13aa86e0bae",
"name": "Sticky Note - Benefits",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1472,
768
],
"parameters": {
"width": 280,
"height": 220,
"content": "## 💡 KEY BENEFITS\n\n✅ Automatic no-show detection\n✅ Immediate customer re-engagement\n✅ Sales team stays informed\n✅ Prioritizes high-value leads\n✅ Reduces manual follow-up work\n✅ Increases reschedule rate"
},
"typeVersion": 1
},
{
"parameters": {
"operation": "verify",
"email": "={{ $json.metadata ? $json.metadata.rep_email : 'sales@yourcompany.com' }}",
"additionalOptions": {}
},
"type": "n8n-nodes-billionverify.billionVerify",
"typeVersion": 1,
"position": [
-296,
768
],
"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": [
-116,
768
],
"name": "IF deliverable"
}
],
"connections": {
"Hourly Check Trigger": {
"main": [
[
{
"node": "Get Active Calendly Appointments",
"type": "main",
"index": 0
}
]
]
},
"Check If High Intent Lead": {
"main": [
[
{
"node": "Send Reschedule Link via Telegram",
"type": "main",
"index": 0
}
]
]
},
"Get Active Calendly Appointments": {
"main": [
[
{
"node": "Filter No-Show Appointments (30+ min past)",
"type": "main",
"index": 0
}
]
]
},
"Send Reschedule Link via Telegram": {
"main": [
[
{
"node": "Verify Email (BillionVerify)",
"type": "main",
"index": 0
}
]
]
},
"Filter No-Show Appointments (30+ min past)": {
"main": [
[
{
"node": "Check If High Intent Lead",
"type": "main",
"index": 0
}
]
]
},
"Verify Email (BillionVerify)": {
"main": [
[
{
"node": "IF deliverable",
"type": "main",
"index": 0
}
]
]
},
"IF deliverable": {
"main": [
[
{
"node": "Alert Sales Rep via Email",
"type": "main",
"index": 0
}
],
[]
]
}
},
"settings": {
"executionOrder": "v1"
}
}Workflow templates with Calendly
Ready-to-use workflows that verify emails before Calendly sends.
How it works
- 1
An invitee books a meeting through your Calendly scheduling link.
- 2
Calendly fires a webhook event that triggers an n8n workflow or Integrately automation.
- 3
The invitee's email is sent to BillionVerify, which checks validity, domain health, mailbox existence, and disposable status.
- 4
The verification result is used to tag the booking, update your CRM, or trigger an alert if the address is problematic.
- 5
Your team can act on flagged bookings before the scheduled meeting rather than discovering the issue after a no-show.
When to use this
Qualify inbound leads at the booking stage
When a prospect books a sales call through Calendly, BillionVerify immediately checks their email. Leads using disposable or throwaway addresses can be flagged for review before your team spends time preparing for a meeting with an unverifiable contact.
Sync verified contacts to your CRM
After a Calendly booking triggers a CRM contact creation, pass the email through BillionVerify first. Only verified addresses get synced, preventing your CRM from filling with junk contacts that inflate usage limits and skew pipeline data.
Improve reminder and follow-up deliverability
Calendly sends automated reminders and post-meeting follow-ups. Verifying emails at booking time ensures these sequences reach real inboxes, reducing no-show rates and improving the effectiveness of your post-meeting outreach.
FAQ
Can I automatically cancel bookings from invalid email addresses?
With n8n or Integrately, you can build a workflow that cancels or holds a booking when BillionVerify returns an invalid result, then notifies the invitee to rebook with a valid address.
Does this integration work with Calendly's team and round-robin event types?
Yes. The webhook fires for any Calendly booking regardless of event type, so the BillionVerify verification step applies equally to individual, team, and round-robin scheduling pages.
How is BillionVerify different from just checking email format?
Format checks only validate syntax. BillionVerify goes further by confirming the domain exists, the mailbox is reachable, and the address is not from a disposable provider or a role account, catching far more invalid addresses.
Which integration path is easiest for a Calendly user without technical resources?
Integrately offers a 1-click setup that connects Calendly to BillionVerify without any coding. For teams that need more customization, the n8n community node provides a flexible visual workflow builder.
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