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Maileroo Mail Tester vs MXToolbox DKIM Lookup: catalog facts
Maileroo Mail Tester	MXToolbox DKIM Lookup
Free The tester is free and runs one test at a time; Maileroo's sending service is a separate…	Free The DKIM lookup is free to use on the website.
Web	Web
Tests a real delivered message rather than only the DNS records Shows SPF evaluation traces and every DKIM signature	Accepts two input formats for domain and selector Explains how DKIM record lookups work on the page
Only one test at a time on the free tool The page also promotes Maileroo's commercial sending service	You need to know the selector in advance Tests the published key only, not a signed message
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.