How to verify an email address in Go

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

Code

resp, _ := http.Get("https://happy.mailtester.ninja/ninja?email=someone@example.com&key=YOUR_API_KEY")
defer resp.Body.Close()

var r struct{ Code, Message string }
json.NewDecoder(resp.Body).Decode(&r)
fmt.Println(r.Code, r.Message) // ok Accepted

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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