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Kitterman SPF Validator vs Maileroo Mail Tester: catalog facts
Kitterman SPF Validator	Maileroo 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
Uses an RFC 7208 compliant library Tests processing limits such as DNS lookup count	Tests a real delivered message rather than only the DNS records Shows SPF evaluation traces and every DKIM signature
Cached DNS results can lag recent changes Plain interface aimed at technical users	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
No account needed	Not stated if an account is 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.