How to Mail tester

Published October 12, 2024 · Updated July 18, 2026 · Email Security

A mail tester checks whether your email will actually reach the inbox before you send it to real people. It scores your message on authentication, content, and reputation, then lists exactly what to fix. Here is how to use a mail tester to protect your deliverability.

What a mail tester checks

Authentication - SPF, DKIM, and DMARC results.
Spam score - risky content and formatting.
Blacklists - whether your IP or domain is listed.
Technical setup - reverse DNS and message structure.

How to use it

Send your email to the tester's unique address, then open the report. A high score means you are inbox-ready; a low one comes with a precise checklist to fix before you send.

Biggest lever: most low scores come from authentication and IP reputation. Fix SPF/DKIM/DMARC and send from a clean dedicated IP first.

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Frequently asked questions

What is a mail tester?

A tool that scores your email's inbox-readiness - authentication, spam score, blacklists, and setup - before you send to real recipients.

How do I improve my mail tester score?

Fix SPF/DKIM/DMARC, send from a reputable dedicated IP, clean your content, and keep lists opt-in.