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Maileroo Mail Tester vs Kitterman SPF Validator: catalog facts
Maileroo Mail Tester	Kitterman SPF Validator
Free The tester is free and runs one test at a time; Maileroo's sending service is a separate…	Free Free to use.
Web	Web
Tests a real delivered message rather than only the DNS records Shows SPF evaluation traces and every DKIM signature	Uses an RFC 7208 compliant library Tests processing limits such as DNS lookup count
Only one test at a time on the free tool The page also promotes Maileroo's commercial sending service	Cached DNS results can lag recent changes Plain interface aimed at technical users
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.