Postmark Spam Check vs DKIM Validator: catalog facts
 Postmark Spam Check |  DKIM Validator |
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Free Provided free by Postmark. |
Free Free to use. |
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Web |
Web |
- Quick SpamAssassin score without running SpamAssassin
- Usable in the browser or through a JSON API
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- DKIM, SPF and SpamAssassin results in one place
- Tests real mail flow rather than just DNS records
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- Only gives a SpamAssassin score, not a full deliverability test
- Messages are sent to a third-party service for checking
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- Test messages are stored on a third-party server
- Only checks messages you send to it
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Web application, Hosted service |
Web application |
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Closed source |
Closed source |
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License not stated |
License not stated |
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Not stated if an account is needed |
No account needed |
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Needs internet |
Needs internet |
Checked September 23, 2026 | Checked September 24, 2026 |
Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.
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