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MailGenius vs DKIM Validator: catalog facts
MailGenius	DKIM Validator
Free Free to use.	Free Free to use.
Web	Web
Checks SPF, DKIM and DMARC together Flags content that may trigger spam filters	DKIM, SPF and SpamAssassin results in one place Tests real mail flow rather than just DNS records
Requires sending a message to a third-party service Site uses bot verification before loading	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 October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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