n8n email verification

The workflow

1. Trigger. A webhook, a Google Sheets row, a form submission or a CRM event gives you an email address.
2. HTTP Request node. Method POST, URL https://mailexchange.com/api/v1/verify. Authentication: Header Auth with Authorization: Bearer YOUR_KEY. Body (JSON): {"email": "{{ $json.email }}"}.
3. IF node. Condition: {{ $json.state }} equals deliverable.
4. True branch: add to your CRM, sequencer or newsletter.
5. False branch: write to a "review" sheet, or discard undeliverable results.

The response includes state, reason, score, accept_all, role, free, disposable and mx. See the API reference.

Handling slow servers

Most checks return in seconds. When a mail server is slow, /verify answers with HTTP 202 and {"state": "pending", "list_id": ...}. In n8n, add a Wait node and then a second HTTP Request to GET /api/v1/lists/{list_id}/results. Details in verify a list with the API.

Bulk lists in n8n

For many addresses, use POST /api/v1/lists with up to 100,000 emails and a callback_url pointing at an n8n Webhook node. Mail Exchange calls it when the list is done, signed with X-MX-Signature. See webhooks and callbacks.

Good practice

• Verify once, after enrichment, on the final address.
• Don't verify every execution of a loop for the same address: de-duplicate first.
• Handle 402 (out of credits) and 429 (rate limit) with an error branch: errors and limits.

FAQ

Is there an n8n node for Mail Exchange?

Not yet. Use the HTTP Request node with your API key; it takes a couple of minutes to set up.

How do I verify an email in n8n?

POST the address to /api/v1/verify with a bearer token, then branch on the state field in an IF node.

How much does it cost?

$0.0058 per address or less, depending on pack size, and unknown results are refunded.

Related

• Zapier
• Make
• Developer guides
• API reference