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Mailpit vs smtp4dev

The same facts for both, read from GitHub every night, and the relation a person reviewed.

Mailpitsmtp4dev
LanguageGoC#
LicenceMITBSD-3-Clause
Stars11k4k
Latestv1.31.43.15.0
Last push2026-10-062026-10-05
Release cadenceabout 11 days between releasestoo few releases
Active contributors4 commit authors on the default branch in the last 90 days4 commit authors on the default branch in the last 90 days
Flagsnonenone

How they relate

  • Both replace Mailtrap. Alternatives to Mailtrap →

    PartialMailpitThe email sandbox only, with SMTP capture, a web inbox, HTML checks and an API; no sending service.

    Partialsmtp4devThe email sandbox only, with a web inbox, IMAP access and relay rules; no sending service.