Sinch email verification with BillionVerify
Sinch is a cloud communications platform that includes email delivery alongside messaging and voice channels. High-quality email sending depends on the list it sends to — bounces and spam traps erode your sender score fast. Connect BillionVerify to Sinch via n8n, Integrately, or the REST API to screen addresses before they enter your sending pipeline.
Why verify before the send
Email-focused communication platforms are sensitive to list hygiene. A bounce rate above acceptable thresholds can result in throttling or account restrictions. BillionVerify removes invalid, role-based, disposable, and unverifiable addresses from your contact sets before any send, protecting both deliverability and your account standing.
Ready-to-use n8n workflow
Import this workflow into n8n — it verifies every address with BillionVerify before Sinch sends, so only deliverable contacts are emailed. Install the BillionVerify community node first, then add your API key.
{
"name": "Verify emails before sending in Sinch + 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 Sinch contacts",
"message": "Replace this Gmail send with your Sinch 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 Sinch
Ready-to-use workflows that verify emails before Sinch sends.
How it works
- 1
Link BillionVerify to your Sinch workflows using the n8n community node, Integrately, or a direct REST API integration.
- 2
Submit each new or existing email address to BillionVerify before it enters a Sinch contact list or send sequence.
- 3
BillionVerify performs syntax validation, DNS and MX record checks, SMTP verification, and disposable provider detection.
- 4
Receive a clear verdict — valid, risky, or invalid — for each address.
- 5
Allow verified addresses into Sinch; route risky or invalid ones to a separate handling workflow.
When to use this
Pre-screen contacts before adding to Sinch send lists
Verify every new email address with BillionVerify before enrolling it in a Sinch campaign or transactional flow. Blocking invalid and risky addresses at the source keeps your list quality high from the start.
Validate opt-ins from web forms and landing pages
Pipe form-submitted email addresses through BillionVerify in real time before passing them to Sinch. Catch typos, disposable addresses, and non-existent mailboxes before they ever appear on a send list.
Re-verify cold or inactive segments
Before reactivating a dormant segment in Sinch, run the addresses through BillionVerify's bulk API to eliminate contacts that have gone cold or invalid since last contact.
FAQ
Why does list hygiene matter so much for email platforms like Sinch?
High bounce rates and spam trap hits damage your sender reputation and can lead to sending restrictions. Verifying addresses before sending keeps those metrics well within safe thresholds.
What is a catch-all address and why should I care?
A catch-all domain accepts all incoming mail regardless of whether the specific mailbox exists. BillionVerify flags these so you can decide whether to include or exclude them from sensitive campaigns.
Can BillionVerify verify emails in bulk for Sinch lists?
Yes. Submit a list of addresses to the BillionVerify bulk API and receive back a verified dataset ready for import into Sinch.
Verify emails in Sinch
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