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Maileroo Mail Tester vs MultiRBL: catalog facts
Maileroo Mail Tester	MultiRBL
Free The tester is free and runs one test at a time; Maileroo's sending service is a separate…	Free Free to use, with optional Bitcoin donations.
Web	Web
Tests a real delivered message rather than only the DNS records Shows SPF evaluation traces and every DKIM signature	Checks over 200 blacklists and whitelists Supports IPv4 and IPv6
Only one test at a time on the free tool The page also promotes Maileroo's commercial sending service	No help with removal requests Plain interface with lots of technical output
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.