Block Survey email verification with BillionVerify
BlockSurvey is a privacy-focused forms platform that lets you collect survey responses without tracking respondents. Add BillionVerify to the workflow to validate email addresses collected through your surveys before storing or acting on them.
Why verify before the send
Survey respondents sometimes enter mistyped or fake email addresses, making follow-up impossible and polluting your contact list with undeliverable data. Verifying addresses the moment they are submitted keeps your list clean, improves follow-up delivery rates, and filters out disposable inboxes used to game incentivized surveys.
Ready-to-use n8n workflow
Import this workflow into n8n — it verifies every address with BillionVerify before Block Survey sends, so only deliverable contacts are emailed. Install the BillionVerify community node first, then add your API key.
{
"name": "Verify emails before sending in BlockSurvey + BillionVerify",
"nodes": [
{
"parameters": {},
"type": "n8n-nodes-base.manualTrigger",
"typeVersion": 1,
"position": [
240,
300
],
"name": "When clicking ‘Test workflow’"
},
{
"parameters": {
"assignments": {
"assignments": [
{
"id": "email-field",
"name": "email",
"value": "jane@example.com",
"type": "string"
}
]
},
"options": {}
},
"type": "n8n-nodes-base.set",
"typeVersion": 3.4,
"position": [
460,
300
],
"name": "Get contacts"
},
{
"parameters": {
"sendTo": "={{ $json.email }}",
"subject": "Message for BlockSurvey contacts",
"message": "Replace this Gmail send with your BlockSurvey node — only deliverable, verified contacts reach it.",
"options": {}
},
"type": "n8n-nodes-base.gmail",
"typeVersion": 2.1,
"position": [
900,
300
],
"name": "Send email",
"webhookId": "",
"credentials": {
"gmailOAuth2": {
"id": "",
"name": "Gmail account"
}
}
},
{
"parameters": {
"operation": "verify",
"email": "={{ $json.email }}",
"additionalOptions": {}
},
"type": "n8n-nodes-billionverify.billionVerify",
"typeVersion": 1,
"position": [
540,
300
],
"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": [
720,
300
],
"name": "IF deliverable"
}
],
"connections": {
"When clicking ‘Test workflow’": {
"main": [
[
{
"node": "Get contacts",
"type": "main",
"index": 0
}
]
]
},
"Get contacts": {
"main": [
[
{
"node": "Verify Email (BillionVerify)",
"type": "main",
"index": 0
}
]
]
},
"Verify Email (BillionVerify)": {
"main": [
[
{
"node": "IF deliverable",
"type": "main",
"index": 0
}
]
]
},
"IF deliverable": {
"main": [
[
{
"node": "Send email",
"type": "main",
"index": 0
}
],
[]
]
}
},
"settings": {
"executionOrder": "v1"
}
}Workflow templates with Block Survey
Ready-to-use workflows that verify emails before Block Survey sends.
How it works
- 1
Connect BillionVerify to BlockSurvey using the n8n community node or a one-click Integrately flow.
- 2
Set the workflow to trigger on each new survey submission that includes an email field.
- 3
BillionVerify validates the address — checking syntax, domain, mailbox existence, and disposable status.
- 4
Valid addresses pass through to your CRM, email tool, or database; invalid ones are flagged or discarded.
- 5
Review verification results in BillionVerify's dashboard to track submission quality over time.
When to use this
Clean Leads from Incentivized Surveys
When surveys offer rewards, participants may submit disposable or fake addresses to claim multiple entries. BillionVerify catches these at submission time, so only genuine respondents reach your follow-up campaigns.
Validate Contact Details Before CRM Import
Survey responses destined for a CRM or email platform benefit from verification before import. Removing invalid addresses up front prevents bounce spikes and keeps your sender score intact.
FAQ
Can I verify emails in real time as survey responses come in?
Yes. Using the n8n integration or Integrately, each new BlockSurvey submission can trigger an instant BillionVerify check, so your list stays clean without any manual review step.
What types of problematic addresses does BillionVerify detect?
BillionVerify identifies invalid syntax, non-existent domains, undeliverable mailboxes, disposable email services, role-based addresses, and catch-all domains — covering the most common sources of survey list pollution.
Will verification slow down the survey submission experience?
Verification runs asynchronously in your automation workflow after submission, so respondents experience no delay. Results are available within seconds for downstream routing decisions.
Is the REST API an option if I have a custom BlockSurvey integration?
Absolutely. BillionVerify exposes a straightforward REST API you can call from any webhook or server-side script, giving you full control over when and how verification is triggered.
Verify emails in Block Survey
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