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Mail-in-a-Box vs mailcow

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

Mail-in-a-Boxmailcow
LanguagePythonJavaScript
LicenceCC0-1.0GPL-3.0
Stars15k14k
Latestv772026-09a
Last push2026-09-262026-10-06
Release cadenceabout 116 days between releasesabout 18 days between releases
Active contributors4 commit authors on the default branch in the last 90 days11 commit authors on the default branch in the last 90 days
Flagsnonenone

How they relate

  • Both replace Google Workspace. Alternatives to Google Workspace →

    PartialMail-in-a-BoxMail, contacts and calendars for your own domains on one Ubuntu server, without the office apps.

    PartialmailcowMail, calendars and contacts with SOGo webmail; no office suite.