Mail Tester

Find out if your email will reach the inbox. We give you a unique address — send any message to it and we score it with the famous SpamAssassin filter plus full SPF, DKIM, DMARC, rDNS, MX and blocklist checks.

Free: 10 test addresses per 24 hours · report stays online for 7 days.

What we check

SpamAssassinThe real spam filter, running on our server — the same engine mail receivers use. Every rule that fires on your message is shown with its score.
SPF / DKIM / DMARCFull authentication analysis: both mail-from and HELO SPF identities, every DKIM signature verified against DNS with key strength, and DMARC policy evaluation with alignment.
Server configurationReverse DNS (PTR) and its association with your HELO name, whether your HELO resolves back to the sending IP, and MX records of your sender domain.
Content qualityText/HTML balance, images missing ALT text, dangerous HTML (script/iframe/embed), URL shorteners, broken links, List-Unsubscribe header, attachments.
BlocklistsYour sending IP is matched against 20 of the most common IPv4 blocklists (Spamhaus-class, SpamCop, Barracuda, mailspike and friends) — the same set mail-tester.com checks.

How it works

  1. Click Generate test address — you get a unique test-…@srv1.toolsbd.io address.
  2. Send a message to it from the mail account, app or newsletter system you want to test. Send a realistic message — the report reflects exactly what receivers see.
  3. Stay on the page: as soon as the message arrives (a few seconds), the full report appears automatically.
  4. Fix what the report flags, then click New test and send again to verify the improvement.

FAQ

How many tests can I run?

You can create 10 test addresses per 24 hours from one network. Each address can receive one message within 24 hours of being created.

How long is my report available?

7 days. Keep the permalink; anyone who has it can view the report. You can delete a test at any time with the button in the report.

A perfect score but still landing in spam?

Deliverability depends on more than content: your domain's reputation and history, engagement of your recipients and the receiver's own filters all matter. A 10/10 means the technical fundamentals are right.

Can I test multiple senders?

Yes — generate an address for each sender, or use one address per test. A new message to the same address replaces its previous report.