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Mail-Tester's free deliverability checker. You send a test email to a unique address it generates, and within seconds you get a spam score out of ten with line-by-line fixes for every issue flagged. The fastest way to diagnose why your emails are landing in spam folders.
How to use it
Open Mail-Tester and copy the unique test email address it shows on the page.
Send a real email from your usual platform to that test address. Use the same template you use in production.
Click "Then check your score" on the Mail-Tester page after sending.
Review the full report. It covers SPF, DKIM, DMARC, content issues, blacklist checks, and link health.
Walk through each flagged issue. Mail-Tester explains every one and gives a recommended fix.
Implement the fixes, retest, and confirm the score crosses 9 out of 10 before launching the campaign.
Best-fit use cases
Pre-launch deliverability QA
Test every campaign template before sending to confirm it lands in inbox and not in spam.
New domain warmup
Track score improvement as you warm up a new sending domain over weeks.
Deliverability debugging
Diagnose why specific campaigns or sender domains are landing in spam.
Cold outbound checks
Validate cold sequence templates before scaling outbound to confirm they pass major filters.