New Playbook: Cold Email Infrastructure Setup Guide
Read Now arrow_forwardOne POST, one JSON answer: Valid, Invalid or Unknown, with a real handshake to the recipient's mail server behind it. Bearer key, 100 free credits a day, 300,000 credits for $9.99 a month. No SDK to install.
Used by 1,000+ sales, recruiting and marketing teams
Verify one address or a whole list, and find addresses with the same key. Every call is a JSON POST with a Bearer token in the header.
POST /email/verifyEmail with an address. You get status, domain and processing time back in one response. Built for signup forms and CRM triggers.
Get a key and try it arrow_forwardPOST /email/verifyBulkEmail with an array of addresses. One request, every address checked, one JSON back. Built for nightly list hygiene and pre-send checks.
Get a key and try itPOST /email/findEmail with a first name, last name and domain returns a found address with its status. Pair it with the verifier in enrichment pipelines.
View API docs arrow_forwardPlenty of validation APIs stop at syntax and an MX lookup and call it done. Every Mailsfinder verifyEmail call runs the full sequence before it answers, which is why the status you get is one you can act on.
Rejects malformed addresses with a 422 before any network work happens.
Confirms the domain exists and has mail servers. No MX means Invalid, immediately.
Opens a conversation with the mail server and asks whether the mailbox exists, without delivering anything.
Valid, Invalid or Unknown, with the domain and processing time, in the JSON you already parse.
The docs page carries cURL, JavaScript and Python for every endpoint. A single verification is three steps, and it is all most integrations need.
Authenticate
Authorization: Bearer YOUR_API_KEY. Keys live under Account and API in the dashboard.
Send the address
POST https://server.mailsfinder.com/api/access-key/email/verifyEmail with {"email": "jane@stripe.com"}.
Read the status
A 200 returns email, status, domain and time. 422 is a bad format, 429 means slow down, 500 means the mail server did not answer.
Validate at signup and block dead or throwaway addresses before a trial account is created.
Verify on write in HubSpot, Clay, n8n or Make so bad data never reaches the list.
Re-verify every list the night before a campaign, straight from the sending tool.
Verify client lists on a schedule and pass the cost through at $0.03 per thousand.
Get your API key in the dashboard, make your first call in a few minutes, and pay $9.99 a month for 300,000 credits when you outgrow the free 100 a day.
