Alternatives to Mail Tester

A web tool that scores how likely an email is to be marked as spam. The listings below can replace it for an important use case. Each note says what changes if you switch.

  • Mail Tester

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

    FreeProprietaryWeb

Replacements

Listings that take over the same core job as Mail Tester.

  • Maileroo Mail Tester

    A free web tool that grades a test email for authentication, spam score, DNS and blacklists.

    FreeProprietaryWeb

    Maileroo Mail Tester also grades a real sent email and adds SPF traces, DKIM signature details, BIMI and MTA-STS checks, with suggested DNS records on failure.

  • GlockApps

    An online email deliverability tester that checks inbox placement, spam scores, blocklists and domain authentication.

    FreemiumProprietaryWeb

    GlockApps shows inbox or spam placement across major mail providers along with authentication and blocklist checks, though full seed-list testing is paid.

  • LearnDMARC

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

    FreeProprietaryWeb

    LearnDMARC also tests a real message but focuses on visually explaining SPF, DKIM and DMARC alignment rather than giving a spam score.

  • Postmark Spam Check

    A free web tool and JSON API that returns the SpamAssassin score of an email message.

    FreeProprietaryWeb

    Postmark Spam Check returns only a SpamAssassin score for a pasted message through the web or a JSON API, without a full deliverability test.

Also worth comparing

These listings name Mail Tester as their own alternative, so the relationship runs both ways.

  • DKIM Validator

    Web tool that checks DKIM, SPF and SpamAssassin results for a test email you send.

    FreeProprietaryWeb

    Mail Tester scores a single sent email out of 10 for spam likelihood and offers an API, with less detail on what each check covers.

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

  • MXToolbox Blacklist Check

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

    FreeProprietaryWeb

  • MultiRBL

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

    FreeProprietaryWeb

  • Kitterman SPF Validator

    Online SPF tools that retrieve and validate a domain's SPF record or test a draft record.

    FreeProprietaryWeb

  • EasyDMARC DMARC Lookup

    A free web tool that looks up a domain's DMARC record and checks it for configuration errors.

    FreeProprietaryWeb

  • CheckTLS

    A web tool that tests whether a recipient's mail server accepts secure TLS connections for email.

    FreemiumProprietaryWeb