MailTester NinjaDeliverability
Verify an email

How to verify an email address in Python

Verify whether an email address is real and deliverable, in real time, from Python, using the MailTester Ninja API. One HTTP call. Nothing is stored on our side.

Code

import requests

r = requests.get("https://happy.mailtester.ninja/ninja", params={
    "email": "someone@example.com",
    "key": "YOUR_API_KEY",
})
data = r.json()
print(data["code"], data["message"])  # -> ok Accepted

What you get back

okAcceptedthe mailbox exists and accepts mail
koRejectedinvalid / undeliverable address
mbCatch-All / uncertaindomain accepts everything, or temporary state

Get a free API key at mailtester.ninja/api. Prefer a quick manual check? Use the free domain analyzer.