🛠️ Tool
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Free
Beginner
Why we picked it Before you send a single cold email to a real prospect, send one to this tool. It gives you a spam score out of 10, checks your SPF, DKIM, and DMARC in one pass, and flags content and formatting issues, so you catch a broken setup on a test message instead of finding out from a prospect's spam folder.
Mail Tester
From mail-tester.com
- Get an instant spam score plus a breakdown of exactly what is wrong
- Verifies SPF, DKIM, and DMARC are actually passing, not just present
- Use it every time you change domains, ESPs, or email content, not just once
