TSTP Mail Auth Tester
Test SMTP authentication with clear errors and guided recovery.
What it is
TSTP Mail Auth Tester (MAT) is a free open-source helper for validating SMTP authentication and email configuration. It emphasizes readable errors and guided remediation so mail setup stops being guesswork.
Who it is for
Developers, sysadmins, and support staff diagnosing outbound mail failures.
Screenshots
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About this product & key features
Detailed capabilities that make this tool reliable in real workflows — not marketing fluff.
Auth probe
Validate SMTP auth before you ship mail-dependent features.
Readable failures
Errors meant for humans, not only log dumps.
Guided recovery
Point toward likely misconfigurations quickly.
Capabilities
- Test SMTP authentication paths
- Surface clear error messages
- Guide common configuration fixes
- Support troubleshooting before production cutover
- Useful for shared hosting and self-hosted mail stacks
How to use it
- Open Mail Auth Tester.
- Enter the SMTP host and credentials you are authorized to test.
- Run the authentication check and read the result carefully.
- Apply the suggested remediation, then re-test.
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