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