Alternatives to Postmark Spam Check

A free web tool and JSON API that returns the SpamAssassin score of an email message. The listings below can replace it for an important use case. Each note says what changes if you switch.

Replacements

Listings that take over the same core job as Postmark Spam Check.

  • Mail Tester

    A web tool that scores how likely an email is to be marked as spam.

    FreeProprietaryWeb

    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.

    FreeProprietaryWeb

    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.

    FreeProprietaryWeb

    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.

    FreemiumProprietaryWeb

    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.

    FreeOpen sourceWebSelf-hostedCommand line

    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 a direct replacement.

  • MXToolbox

    A web-based suite of DNS, MX, SPF, DMARC and blacklist lookups for diagnosing email delivery.

    FreemiumProprietaryWeb

  • Sender Score

    Free web tool from Validity that rates the email sending reputation of an IP address or domain.

    FreeProprietaryWeb

  • MXToolbox Blacklist Check

    An online tool that tests a mail server IP or domain against over 100 DNS blacklists.

    FreeProprietaryWeb

  • Google Postmaster Tools

    Google's web dashboard for checking a sending domain's reputation and mail deliverability to Gmail.

    FreeProprietaryWeb

  • LearnDMARC

    An interactive web console that visualizes how SPF, DKIM and DMARC evaluate a real email.

    FreeProprietaryWeb

  • MultiRBL

    A free tool that checks a mail server IP against over 200 DNS blacklists and whitelists.

    FreeProprietaryWeb