← All Productivity
Trello email verification with BillionVerify
Trello is a visual project management tool that teams use to organize tasks, track progress, and collaborate across boards, lists, and cards. When Trello is part of a workflow that collects team member or stakeholder emails — through forms, integrations, or onboarding automations — verifying those addresses keeps collaboration notifications and invitations working reliably.
Why verify before the send
Trello sends email invitations, board notifications, and due-date reminders. If a team member's address is mistyped, disposable, or tied to an inactive domain, they miss updates and cards go unactioned. Running new member emails through BillionVerify before they are added to a board prevents that communication gap from forming.
Ready-to-use n8n workflow
Import this workflow into n8n — it verifies every address with BillionVerify before Trello 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-trello.json
{
"name": "Automate beta tester verification & onboarding with Trello, Gmail and QR codes + BillionVerify",
"nodes": [
{
"id": "eb6791dc-be3d-4929-a21a-e2602bd3e454",
"name": "Webhook",
"type": "n8n-nodes-base.webhook",
"position": [
784,
848
],
"webhookId": "",
"parameters": {
"path": "beta-access",
"options": {},
"httpMethod": "POST",
"responseMode": "lastNode"
},
"typeVersion": 1
},
{
"id": "371245d6-c98f-4436-91c4-8767480c4147",
"name": "IF",
"type": "n8n-nodes-base.if",
"position": [
1280,
848
],
"parameters": {
"conditions": {
"boolean": [
{
"value1": "={{ $json.valid }}",
"value2": true
}
]
}
},
"typeVersion": 1
},
{
"id": "607b66f3-bb20-4c48-9523-def472f5529f",
"name": "Respond Error",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1744,
1072
],
"parameters": {
"options": {
"responseCode": 400
},
"respondWith": "json",
"responseBody": "={{ {\n \"status\": \"error\",\n \"message\": \"Invalid or disposable email address detected\",\n \"email\": $json.tester_email,\n \"reason\": $json.is_disposable ? \"Disposable email\" : \"Invalid email format\"\n} }}"
},
"typeVersion": 1
},
{
"id": "78ad0706-e0c6-4ce2-8093-623fc344bce8",
"name": "Generate Access Code",
"type": "n8n-nodes-base.code",
"position": [
1728,
672
],
"parameters": {
"jsCode": "// Generate unique beta access code\nconst inputData = $input.all();\n\nconst generateCode = () => {\n return \"BETA-\" + Math.random().toString(36).substring(2, 8).toUpperCase();\n};\n\nconst outputData = inputData.map(item => ({\n json: {\n ...item.json,\n access_code: generateCode(),\n timestamp: new Date().toISOString(),\n timestamp_readable: new Date().toLocaleString('en-US', {\n dateStyle: 'medium',\n timeStyle: 'short'\n }),\n year: new Date().getFullYear()\n }\n}));\n\nreturn outputData;"
},
"typeVersion": 2
},
{
"id": "61a0cac4-f03e-4cc1-8a87-d20fd67ffe98",
"name": "Generate QR Code",
"type": "n8n-nodes-base.httpRequest",
"position": [
1984,
672
],
"parameters": {
"url": "=https://api.qrserver.com/v1/create-qr-code/?data={{ $json.access_code }}&size=200x200&format=png",
"options": {
"response": {
"response": {
"responseFormat": "file"
}
}
}
},
"typeVersion": 4.1
},
{
"id": "1ca7c61b-ac6c-4a77-b16d-c13e61eae6dd",
"name": "Send Gmail",
"type": "n8n-nodes-base.gmail",
"position": [
2880,
672
],
"webhookId": "",
"parameters": {
"sendTo": "={{ $('Webhook').item.json.body.tester_email }}",
"message": "=<div style=\"font-family: 'Segoe UI', Arial, sans-serif; max-width: 600px; margin: 0 auto; background: #f8f9fa; padding: 20px;\">\n <div style=\"background: white; border-radius: 12px; padding: 40px; box-shadow: 0 4px 6px rgba(0,0,0,0.1);\">\n \n <div style=\"text-align: center; margin-bottom: 30px;\">\n <h1 style=\"color: #0B84F3; margin: 0; font-size: 32px;\">🎉 Welcome to Beta Testing!</h1>\n </div>\n \n <h2 style=\"color: #333; font-size: 20px;\">Hi {{ $('Webhook').item.json.body.tester_name }},</h2>\n \n <p style=\"color: #666; font-size: 16px; line-height: 1.6;\">\n Great news! Your email has been <strong style=\"color: #10b981;\">verified successfully</strong>. 🎉\n </p>\n \n <p style=\"color: #666; font-size: 16px; line-height: 1.6;\">\n You're now officially part of the <strong>{{ $('Webhook').item.json.body.product_name }}</strong> Beta Testing Program. We're excited to have you on board!\n </p>\n \n <div style=\"background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%); padding: 25px; border-radius: 12px; margin: 30px 0; border-left: 4px solid #0B84F3;\">\n <h3 style=\"margin-top: 0; color: #333; font-size: 18px;\">🔐 Your Beta Access Details</h3>\n \n <div style=\"margin: 15px 0;\">\n <p style=\"margin: 8px 0; color: #666;\">\n <strong>🔑 Access Code:</strong> \n <code style=\"background: #0B84F3; color: white; padding: 8px 16px; border-radius: 6px; font-size: 18px; letter-spacing: 2px; font-weight: bold;\">{{ $('Generate Access Code').item.json.access_code }}</code>\n </p>\n </div>\n \n <p style=\"margin: 8px 0; color: #666;\"><strong>📦 Product:</strong> {{ $('Webhook').item.json.body.product_name }}</p>\n <p style=\"margin: 8px 0; color: #666;\"><strong>🗓 Signup Date:</strong> {{ $('Webhook').item.json.body.signup_date }}</p>\n <p style=\"margin: 8px 0; color: #666;\"><strong>⏰ Verified:</strong> {{ $('Generate Access Code').item.json.timestamp_readable }}</p>\n </div>\n \n <div style=\"background: #fff3cd; border: 1px solid #ffc107; border-radius: 8px; padding: 15px; margin: 20px 0;\">\n <p style=\"margin: 0; color: #856404; font-size: 14px;\">\n <strong>📋 Next Steps:</strong>\n </p>\n <ol style=\"color: #856404; font-size: 14px; margin: 10px 0; padding-left: 20px;\">\n <li>Save your access code securely</li>\n <li>Check your downloads for the official Beta Access Kit</li>\n <li>Use the QR code to activate your beta account</li>\n <li>Start testing and share your feedback!</li>\n </ol>\n </div>\n \n <p style=\"color: #666; font-size: 16px; line-height: 1.6;\">\n Your <strong>official Beta Access Kit</strong> visual is available at the link below. You can also scan the QR code included to activate your beta account securely.\n </p>\n \n <div style=\"text-align: center; margin: 30px 0;\">\n <a href=\"{{ $json.image_url }}\" style=\"display: inline-block; background: linear-gradient(135deg, #0B84F3 0%, #0066CC 100%); color: white; padding: 14px 32px; text-decoration: none; border-radius: 8px; font-weight: 600; font-size: 16px; box-shadow: 0 4px 15px rgba(11, 132, 243, 0.3);\">📥 View Your Access Kit</a>\n </div>\n \n <div style=\"background: #e3f2fd; border-radius: 8px; padding: 20px; margin: 25px 0;\">\n <p style=\"margin: 0; color: #1565c0; font-size: 14px;\">\n <strong>💡 Need Help?</strong><br>\n If you have any questions or encounter any issues, feel free to reach out to our support team. We're here to help!\n </p>\n </div>\n \n <p style=\"color: #666; font-size: 16px; line-height: 1.6;\">\n Happy Testing! We can't wait to hear your feedback. 🚀\n </p>\n \n <p style=\"color: #666; font-size: 16px; line-height: 1.6; margin-top: 30px;\">\n Best regards,<br>\n <strong>The {{ $('Webhook').item.json.body.product_name }} Team</strong>\n </p>\n \n <hr style=\"margin: 40px 0; border: none; border-top: 2px solid #eee;\">\n \n <p style=\"font-size: 12px; color: #999; text-align: center; margin: 0;\">\n This is an automated message from the Beta Testing Program.<br>\n Please do not reply directly to this email.<br>\n © {{ $('Generate Access Code').item.json.year }} All rights reserved.\n </p>\n \n </div>\n</div>",
"options": {},
"subject": "=🎉 Welcome to {{ $('Webhook').item.json.body.product_name }} Beta Program"
},
"credentials": {
"gmailOAuth2": {
"id": "credential-id",
"name": "gmailOAuth2 Credential"
}
},
"typeVersion": 2.1
},
{
"id": "9bf7d30c-d2df-4077-b259-bd8e899e0ab9",
"name": "Respond Success",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
3616,
672
],
"parameters": {
"options": {},
"respondWith": "json",
"responseBody": "={{ {\n \"status\": \"success\",\n \"message\": \"Beta tester verified and access kit delivered successfully\",\n \"data\": {\n \"tester_name\": $json.tester_name,\n \"tester_email\": $json.tester_email,\n \"access_code\": $json.access_code,\n \"product_name\": $json.product_name,\n \"signup_date\": $json.signup_date,\n \"verification_timestamp\": $json.timestamp,\n \"access_kit_url\": $json.url,\n \"trello_card_created\": true,\n \"email_sent\": true,\n \"qr_code_generated\": true\n },\n \"next_steps\": [\n \"Check email for welcome kit\",\n \"Scan QR code to activate\",\n \"Start beta testing\"\n ]\n} }}"
},
"typeVersion": 1
},
{
"id": "cabcc672-ce7f-4934-8124-2dca643b953e",
"name": "Verifi Email",
"type": "n8n-nodes-verifiemail.verifiEmail",
"position": [
1040,
848
],
"parameters": {
"email": "={{ $json.body.tester_email }}"
},
"credentials": {
"verifiEmailApi": {
"id": "credential-id",
"name": "verifiEmailApi Credential"
}
},
"typeVersion": 1
},
{
"id": "3c0b3253-9ce7-43bd-af89-47c3e94c56c2",
"name": "HTML/CSS to Image",
"type": "n8n-nodes-htmlcsstoimage.htmlCssToImage",
"position": [
2576,
672
],
"parameters": {
"html_content": "=<html>\n<head>\n <style>\n body { margin: 0; padding: 20px; font-family: Arial, sans-serif; background: #f5f5f5; }\n .card { \n background: white; \n border: 3px solid #0B84F3; \n border-radius: 12px; \n padding: 40px; \n max-width: 600px; \n margin: 0 auto;\n box-shadow: 0 4px 6px rgba(0,0,0,0.1);\n }\n h1 { color: #0B84F3; text-align: center; margin-bottom: 30px; }\n .info-row { \n display: flex; \n justify-content: space-between; \n padding: 12px; \n border-bottom: 1px solid #eee; \n }\n .label { font-weight: bold; color: #333; }\n .value { color: #666; }\n .qr-section { \n text-align: center; \n margin: 30px 0; \n padding: 20px; \n background: #f8f9fa; \n border-radius: 8px;\n }\n .code-box { \n background: #0B84F3; \n color: white; \n padding: 15px 25px; \n border-radius: 8px; \n font-size: 24px; \n font-weight: bold; \n letter-spacing: 2px;\n margin: 20px 0;\n text-align: center;\n }\n .footer { \n text-align: center; \n font-size: 12px; \n color: #999; \n margin-top: 30px; \n padding-top: 20px;\n border-top: 1px solid #eee;\n }\n </style>\n</head>\n<body>\n <div class=\"card\">\n <h1>🎉 Beta Tester Access Card</h1>\n \n <div class=\"info-row\">\n <span class=\"label\">Product:</span>\n <span class=\"value\">{{ $('Webhook').item.json.body.product_name }}</span>\n </div>\n \n <div class=\"info-row\">\n <span class=\"label\">Tester Name:</span>\n <span class=\"value\">{{ $('Webhook').item.json.body.tester_name }}</span>\n </div>\n \n <div class=\"info-row\">\n <span class=\"label\">Email:</span>\n <span class=\"value\">{{ $('Webhook').item.json.body.tester_email }}</span>\n </div>\n \n <div class=\"info-row\">\n <span class=\"label\">Signup Date:</span>\n <span class=\"value\">{{ $('Webhook').item.json.body.signup_date }}</span>\n </div>\n \n <div class=\"code-box\">\n {{ $json.access_code }}\n </div>\n \n <div class=\"qr-section\">\n <p style=\"margin-bottom: 15px; color: #666;\">Scan QR Code to Activate</p>\n <img src=\"https://api.qrserver.com/v1/create-qr-code/?data={{ $json.access_code }}&size=200x200\" alt=\"QR Code\">\n </div>\n \n <div class=\"footer\">\n <p>Generated: {{ $json.timestamp_readable }}</p>\n <p>⚠️ Keep this code confidential. Do not share publicly.</p>\n </div>\n </div>\n</body>\n</html>"
},
"credentials": {
"htmlcsstoimgApi": {
"id": "credential-id",
"name": "htmlcsstoimgApi Credential"
}
},
"typeVersion": 1
},
{
"id": "210532a5-f00c-4ee0-82e8-0098f63132cd",
"name": "Create a card",
"type": "n8n-nodes-base.trello",
"position": [
3136,
672
],
"parameters": {
"name": "={{ $('Webhook').item.json.body.tester_name }} – {{ $('Webhook').item.json.body.product_name }}",
"listId": "6908a49d052093d846300299",
"description": "=✅ **Email Verified**\n\n**Tester Information:**\n👤 **Name:** {{ $('Webhook').item.json.body.tester_name }}\n📧 **Email:** {{ $('Webhook').item.json.body.tester_email }}\n🔑 **Access Code:** `{{ $('Generate Access Code').item.json.access_code }}`\n📅 **Signup Date:** {{ $('Webhook').item.json.body.signup_date }}\n⏰ **Processed:** {{ $('Generate Access Code').item.json.timestamp_readable }}",
"additionalFields": {}
},
"credentials": {
"trelloApi": {
"id": "credential-id",
"name": "trelloApi Credential"
}
},
"typeVersion": 1
},
{
"id": "0285670a-7e85-42bd-be22-fd821e8af194",
"name": "QR Code URL",
"type": "n8n-nodes-base.set",
"position": [
2288,
672
],
"parameters": {
"fields": {
"values": [
{
"name": "qrcodeurl",
"stringValue": "=https://api.qrserver.com/v1/create-qr-code/?data={{ $json.access_code }}&size=200x200&format=png"
}
]
},
"options": {}
},
"typeVersion": 3.2
},
{
"id": "5a3d5242-14fd-486a-95c5-d8acd1e4b836",
"name": "Section: Input & Validation",
"type": "n8n-nodes-base.stickyNote",
"position": [
736,
576
],
"parameters": {
"color": 7,
"width": 712,
"height": 440,
"content": "\n## Anti-Fraud Email Gate\n\n**Why this matters** \nDisposable emails (10minutemail, temp-mail, etc.) = fake signups → wasted keys → polluted feedback.\n\n**What happens** \n- VerifiEmail checks: real inbox + not disposable \n- Valid → continue to access kit \n- Invalid → instant 400 error with reason\n\n**Success rate** \nCatches ~30% of junk signups in real betas\n"
},
"typeVersion": 1
},
{
"id": "657baf8c-7f95-4004-b042-8562e5baaac3",
"name": "Section: Error",
"type": "n8n-nodes-base.stickyNote",
"position": [
1664,
944
],
"parameters": {
"color": 7,
"width": 360,
"height": 264,
"content": "## Error Handling\n\nReturns 400 error with details when email validation fails (invalid format or disposable email detected)."
},
"typeVersion": 1
},
{
"id": "1c88dde8-7a44-4836-a77f-8fda92d8ad75",
"name": "Section: Kit Generation",
"type": "n8n-nodes-base.stickyNote",
"position": [
1664,
320
],
"parameters": {
"color": 7,
"width": 1072,
"height": 520,
"content": "## Instant Access Kit Creation\n\n**What gets created** \n- Unique code: `BETA-XXXXX` (6 chars, uppercase) \n- Scannable QR code (PNG) \n- Branded HTML access card with name, product, date \n- Direct image URL for email embed\n\n**Customization** \n- Edit colors in HTML/CSS to Image node (search `#0B84F3`) \n- Add your logo → replace placeholder in HTML \n- Change QR data (e.g., link to your dashboard)\n\n**QR currently contains** \nJust the access code — perfect for manual entry or future verification endpoint"
},
"typeVersion": 1
},
{
"id": "b1371181-fcb5-44b6-bdb4-17aeac225093",
"name": "Section: Notifications",
"type": "n8n-nodes-base.stickyNote",
"position": [
2784,
304
],
"parameters": {
"color": 7,
"width": 696,
"height": 524,
"content": "## Welcome Email + Team Tracking\n\n**Tester receives** \n- Beautiful HTML email with embedded access card \n- QR code + big access code \n- Next steps + excitement\n\n**Team gets (Trello)** \n- New card auto-created in your board \n- All tester details + signup time \n- Easy to assign feedback tasks\n\n**Why both?** \nDelight testers · Keep team perfectly synced\n\n**Bonus idea** \nAdd Google Drive node → auto-save all access cards!"
},
"typeVersion": 1
},
{
"id": "6f074679-0e85-476e-a359-c10b629222b8",
"name": "Section: Success",
"type": "n8n-nodes-base.stickyNote",
"position": [
3520,
544
],
"parameters": {
"color": 7,
"width": 360,
"height": 264,
"content": "## Success Response\n\nReturns 200 OK with complete tester data, access code, and confirmation flags for email sent and Trello card created."
},
"typeVersion": 1
},
{
"id": "a9ea5f43-47a5-4f34-a4dc-6ffdbd968950",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-80,
560
],
"parameters": {
"width": 368,
"height": 432,
"content": "## 5-Minute Setup Guide\n\n1. **VerifiEmail** → Add your free API key (verifi.email) \n2. **Gmail** → Connect via OAuth2 (your account) \n3. **Trello** → Connect + pick a board/list for new testers \n4. **HTMLCSSToImage** → Add API key (htmlcsstoimg.com) \n\n**Test payload (Postman/curl)**\n```json\n{\n \"tester_name\": \"Alex Chen\",\n \"tester_email\": \"alex@gmail.com\",\n \"product_name\": \"SuperApp 2.0\",\n \"signup_date\": \"2025-04-10\"\n}"
},
"typeVersion": 1
},
{
"id": "8ca21eb6-a7c4-43fc-86b2-266758bcb219",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
336,
544
],
"parameters": {
"width": 352,
"height": 480,
"content": "## Beta Tester Onboarding & Access Kit Automation\n\n**What it does** \nAutomatically verifies beta signups → blocks disposable emails → instantly issues unique BETA-XXXXXX access codes + beautiful QR access card → emails welcome kit → logs tester in Trello → returns clean JSON.\n\n**Why you'll love it** \n- Stops 95% of fake beta signups instantly \n- Testers get professional welcome in <10 seconds \n- Zero manual work — fully webhook-ready \n- Perfect for SaaS, mobile apps, hardware betas\n\n**Use cases** \nEarly access programs · Closed betas · Hardware testing · VIP launches"
},
"typeVersion": 1
},
{
"parameters": {
"operation": "verify",
"email": "={{ $('Webhook').item.json.body.tester_email }}",
"additionalOptions": {}
},
"type": "n8n-nodes-billionverify.billionVerify",
"typeVersion": 1,
"position": [
2520,
672
],
"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": [
2700,
672
],
"name": "IF deliverable"
}
],
"connections": {
"IF": {
"main": [
[
{
"node": "Generate Access Code",
"type": "main",
"index": 0
}
],
[
{
"node": "Respond Error",
"type": "main",
"index": 0
}
]
]
},
"Webhook": {
"main": [
[
{
"node": "Verifi Email",
"type": "main",
"index": 0
}
]
]
},
"Send Gmail": {
"main": [
[
{
"node": "Create a card",
"type": "main",
"index": 0
}
]
]
},
"QR Code URL": {
"main": [
[
{
"node": "HTML/CSS to Image",
"type": "main",
"index": 0
}
]
]
},
"Verifi Email": {
"main": [
[
{
"node": "IF",
"type": "main",
"index": 0
}
]
]
},
"Create a card": {
"main": [
[
{
"node": "Respond Success",
"type": "main",
"index": 0
}
]
]
},
"Generate QR Code": {
"main": [
[
{
"node": "QR Code URL",
"type": "main",
"index": 0
}
]
]
},
"HTML/CSS to Image": {
"main": [
[
{
"node": "Verify Email (BillionVerify)",
"type": "main",
"index": 0
}
]
]
},
"Generate Access Code": {
"main": [
[
{
"node": "Generate QR Code",
"type": "main",
"index": 0
}
]
]
},
"Verify Email (BillionVerify)": {
"main": [
[
{
"node": "IF deliverable",
"type": "main",
"index": 0
}
]
]
},
"IF deliverable": {
"main": [
[
{
"node": "Send Gmail",
"type": "main",
"index": 0
}
],
[]
]
}
},
"settings": {
"executionOrder": "v1"
}
}Workflow templates with Trello
Ready-to-use workflows that verify emails before Trello sends.
How it works
- 1
A new collaborator or client email is captured — from a form submission, a CRM sync, or a manual entry connected to a Trello automation.
- 2
The BillionVerify n8n community node or Integrately one-click connection intercepts the email before the Trello invitation is sent.
- 3
BillionVerify validates the address: syntax, MX records, SMTP reachability, and disposable or catch-all domain checks.
- 4
Addresses that pass are forwarded to Trello for board invitation; those that fail are flagged for follow-up.
- 5
The result is a Trello workspace where every member receives notifications reliably, with no silent invitation failures.
When to use this
Board Member Invitation Hygiene
Verify email addresses collected from intake forms or CRM contacts before sending Trello board invitations, reducing bounced invites and ensuring every collaborator actually receives access.
Client Onboarding Workflows
When new clients are onboarded through a Trello-connected automation, BillionVerify checks their email before a board is created and an invitation dispatched, preventing wasted provisioning on invalid addresses.
Stakeholder Notification Lists
Teams that email project status updates to stakeholders listed in Trello can validate those email fields to ensure weekly digests and milestone alerts reach real inboxes.
FAQ
Does BillionVerify work with Trello's built-in automation (Butler)?
BillionVerify connects to Trello via n8n or Integrately rather than Butler natively. You can trigger a BillionVerify check from Butler via a webhook to an n8n workflow.
What kinds of bad email addresses does BillionVerify catch?
It catches typos, nonexistent mailboxes, disposable addresses from temporary email services, role addresses like admin@ or noreply@, and addresses on catch-all domains that may not actually deliver.
Is this useful if I only have a small Trello team?
Even small teams benefit when they collect external client or vendor emails through forms. A single bad address in a client onboarding flow wastes time and creates confusion about who has access.
Can I verify a list of existing Trello member emails in bulk?
Yes. Export your member list and submit it to BillionVerify via the REST API or dashboard bulk upload. You will receive a verified, cleaned list you can use to audit your current workspace membership.
Verify emails in Trello
Create a free account, grab your API key, and stop bounces before they happen.
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