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Verify one single email address online

Type your email address and click "Ninja Verify":

Mailtester Verify

Valid email address response:

Mailtester Verify

Bad email address response:

Mailtester Verify

Unverifiable email address response:

Mailtester Verify


Verify multiple email addresses online

You can type or paste any content including the email addresses you want to verify:

Mailtester Verify

MailTester Ninja will automatically extract all email addresses, will remove all duplicates, and will verify them.

Mailtester Verify

Powerful Email Checker and Finder

MailTester.ninja, Email Address Validator ​​allows you to verify the existence of an email account without sending an email. Most email providers from any country, including gmail.com, hotmail.com, qq.com are supported.

A small number of email providers have disabled the ability to check for existence and provide the same response whether the email exists or not. Therefore, there are three email validation results: (1) email account exists, (2) email account does not exist, and (3) email account is unverifiable, its status is unknown.

The Mickey Mouse Paradox: Many other tools will estimate the validity of unverifiable emails based on email permutation statistics. In many cases they will very often consider emails starting whith mickey.mouse@ as valid: firstname.lastname@. Would Mickey Mouse work for many companies?