How to verify an email address in cURL

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

Code

curl -G "https://happy.mailtester.ninja/ninja" \
  --data-urlencode "email=someone@example.com" \
  --data-urlencode "key=YOUR_API_KEY"

What you get back

`ok`	Accepted	the mailbox exists and accepts mail
`ko`	Rejected	invalid / undeliverable address
`mb`	Catch-All / uncertain	domain accepts everything, or temporary state

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

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