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