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Maileroo Mail Tester vs MXToolbox: catalog facts
Maileroo Mail Tester	MXToolbox
Free The tester is free and runs one test at a time; Maileroo's sending service is a separate…	Freemium Lookups on the site are free to use, with paid plans offered alongside.
Web	Web
Tests a real delivered message rather than only the DNS records Shows SPF evaluation traces and every DKIM signature	Many email and DNS checks in one place MX lookups query the authoritative server directly
Only one test at a time on the free tool The page also promotes Maileroo's commercial sending service	Pages carry prompts for the paid service Each check runs separately rather than as one combined report
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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