Mail-Tester: How to Read Your Email Spam Score

Mail-Tester

Mail-Tester is a free tool that gives an email a spam score out of ten by checking its authentication, content, and sending reputation after you send a message to a unique test address.

How it works

You send your email to the unique address Mail-Tester generates, and it returns a score out of ten with a breakdown: SPF, DKIM, and DMARC status, spam-trigger content, blacklist status, and formatting issues. It's fast, free, and the common first check.

Reading the score

Aim for 10 out of 10, and treat anything below 8 as worth fixing before a real send. The breakdown tells you what to fix, and authentication problems are usually the biggest single lever. For deeper, provider-specific placement, testing covers tools like Litmus and GlockApps.

How Nitrosend compares

Mail-Tester scores one message against one test address. Nitrosend measures placement against about twenty real seed mailboxes across providers and runs automated quality checks on every send, so testing is continuous and built into the send path rather than a manual step.

FAQ

What is Mail-Tester?

A free tool that scores an email out of ten by checking authentication, content, and reputation after you send a message to a unique test address.

What is a good Mail-Tester score?

Aim for 10 out of 10. Below 8 is worth fixing before sending to your list, and the breakdown shows exactly what to address.

Is Mail-Tester enough to test deliverability?

It's a strong quick check for one message. For provider-specific inbox placement across a program, add seed-list testing.