Mail TesterMail Tester Increase your email deliverability

and/or drag one or more text files (txt, csv...) to this drop zone.


  • To activate the unlimited version of Mailtester Ninja, simply paste your access key (including the curly brackets {}) anywhere in the form above.
  • To validate email addresses, just enter any kind of text or list in the Email Verifier form โ€” as long as it contains email addresses, they will be automatically extracted and deduplicated, regardless of format.
  • To find an email address, enter one full name followed by the domain on each line in the Email Finder formย (e.g., John Doe example.com) to search for the corresponding contact’s email.

You can mix and match formats or content โ€” the system is flexible and intelligent enough to detect and process what matters.

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๐ŸŽ‰ MailTesterNinjaApp 1.5 is now available for Windows!

Our powerful email validation utility is now packaged as a standalone Windows application โ€” no installation required. Just download, unzip, and start verifying your email lists instantly. Designed for speed, accuracy, and privacy, MailTesterNinjaApp makes bulk email validation easier than ever.