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About Postmark Spam Check
Postmark Spam Check tells you how SpamAssassin would score an email. Paste in a message with its full headers on the web page and it returns the score, which helps explain why mail might be landing in spam folders.
The same check is available as a lightweight JSON API, so developers can add spam scoring for incoming or outgoing mail to an app without running SpamAssassin themselves. Postmark, the transactional email service, provides it for free.
Strengths
- Quick SpamAssassin score without running SpamAssassin
- Usable in the browser or through a JSON API
- Free to use
Limitations
- Only gives a SpamAssassin score, not a full deliverability test
- Messages are sent to a third-party service for checking
Details
- Pricing
- FreeProvided free by Postmark.
- License
- Proprietary
- Developer
- Postmark
- Platforms
- Web
- How it runs
- Web application, Hosted service
- Works offline
- No
- Best suited for
- Checking why an email might be flagged as spam before sending it
- Categories
- Developer tools, Website testing
- Last verified
- Added
- Provenance
- Facts checked against the developer's own pages and store listings, 1 sources on file.
Alternatives to Postmark Spam Check
Compare allSoftware that can replace Postmark Spam Check for an important use case, and what changes if you switch.
Mail Tester
A web tool that scores how likely an email is to be marked as spam.
Mail Tester scores a real email out of 10 after you send it to a given address and also offers an API, beyond a raw SpamAssassin score.
Maileroo Mail Tester
A free web tool that grades a test email for authentication, spam score, DNS and blacklists.
Maileroo Mail Tester grades a delivered message for spam score plus SPF, DKIM, DNS and blacklists, one free test at a time.
DKIM Validator
Web tool that checks DKIM, SPF and SpamAssassin results for a test email you send.
DKIM Validator returns SpamAssassin results alongside DKIM and SPF checks on a test email, storing messages on a third-party server.
GlockApps
An online email deliverability tester that checks inbox placement, spam scores, blocklists and domain authentication.
GlockApps adds inbox placement across major providers to spam score, authentication and blocklist checks, with full seed-list testing on paid plans.
Mailpit
An email testing tool that catches outgoing messages over SMTP and shows them in a web interface.
Mailpit is open source and self-hosted, catching outgoing mail with built-in spam checks, though scoring relies on a SpamAssassin setup.
Similar software
Related functionality, not necessarily a direct replacement.
MXToolbox
A web-based suite of DNS, MX, SPF, DMARC and blacklist lookups for diagnosing email delivery.
Sender Score
Free web tool from Validity that rates the email sending reputation of an IP address or domain.
MXToolbox Blacklist Check
An online tool that tests a mail server IP or domain against over 100 DNS blacklists.
Google Postmaster Tools
Google's web dashboard for checking a sending domain's reputation and mail deliverability to Gmail.
LearnDMARC
An interactive web console that visualizes how SPF, DKIM and DMARC evaluate a real email.
MultiRBL
A free tool that checks a mail server IP against over 200 DNS blacklists and whitelists.
