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GlockApps vs Postmark Spam Check: catalog facts
GlockApps	Postmark Spam Check
Freemium A free spam checker and DNS record checkers are available; full placement testing and…	Free Provided free by Postmark.
Web	Web
Shows inbox or spam placement across major mail providers Checks SPF, DKIM and DMARC alongside blocklists and spam score	Quick SpamAssassin score without running SpamAssassin Usable in the browser or through a JSON API
Full seed-list testing requires a paid plan Aimed at bulk and marketing senders more than individuals	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 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.