An email verification API you can integrate before lunch

You wanted a function, not a vendor relationship

Most verification providers sell to marketing teams and treat the API as an upsell. You end up on a demo call just to get a key, and then discover rate limits, a proprietary SDK, and a monthly minimum that assumes you verify a million addresses.

You wanted a function that takes a string and tells you whether mail will land.

How it works

1. 1

   POST /v1/verify with an email address. Get back a status and the signals behind it.

2. 2

   Branch on status. Three values matter in practice: valid, invalid, unknown.

3. 3

   Batch when you have a list. POST /v1/verify/bulk, then poll for the result.

import requests

r = requests.post(
    "https://api.mailvalid.io/v1/verify",
    headers={"Authorization": f"Bearer {API_KEY}"},
    json={"email": email},
    timeout=3,
)
result = r.json()

if result["status"] == "invalid" or result["disposable"]:
    raise ValidationError("Please use a valid work email address.")

const res = await fetch("https://api.mailvalid.io/v1/verify", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.MAILVALID_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({ email }),
});
const { status, disposable } = await res.json();

Integration notes we would want if we were you

Why teams pick MailValid