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MailGenius vs Postmark Spam Check: catalog facts
MailGenius	Postmark Spam Check
Free Free to use.	Free Provided free by Postmark.
Web	Web
Checks SPF, DKIM and DMARC together Flags content that may trigger spam filters	Quick SpamAssassin score without running SpamAssassin Usable in the browser or through a JSON API
Requires sending a message to a third-party service Site uses bot verification before loading	Only gives a SpamAssassin score, not a full deliverability test Messages are sent to a third-party service for checking
Web application	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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