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

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