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MailGeniusMaileroo Mail Tester
Free

Free to use.

 Free

The tester is free and runs one test at a time; Maileroo's sending service is a separate…

Web Web
  • Checks SPF, DKIM and DMARC together
  • Flags content that may trigger spam filters
  • Tests a real delivered message rather than only the DNS records
  • Shows SPF evaluation traces and every DKIM signature
  • Requires sending a message to a third-party service
  • Site uses bot verification before loading
  • Only one test at a time on the free tool
  • The page also promotes Maileroo's commercial sending service
Web application Web application
Closed source Closed source
License not stated License not stated
Not stated if an account is needed Not stated if an account is needed
Needs internet Needs internet

Checked October 2, 2026

Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.