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Mail Tester vs DKIM Validator: catalog facts
Mail Tester	DKIM Validator
Free Running a test from the website is free.	Free Free to use.
Web	Web
No setup beyond sending one email to a given address Simple score out of 10 that is easy to read	DKIM, SPF and SpamAssassin results in one place Tests real mail flow rather than just DNS records
Tests a single message rather than ongoing deliverability Little detail on the homepage about what each check covers	Test messages are stored on a third-party server Only checks messages you send to it
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 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.