Today we happy to confirm that mailcow is completely usable with Debian 13 🎉🎉 However, during upgrade you may stumble accross some pitfall: Exim. For this, we wrote a guide:

mailcow: dockerized - Blog

Quick Guide: Upgrading Debian 12 to Debian 13 for mailcow Servers

Moohoo, dear community! With the release of Debian 13 (Trixie), the question arises for you as administrators: How can you perform a smooth dist-up...

You want to host mailcow on your own but do not know how? And you want to see the whole installation process prior before getting started? Then checkout the video from our community member Webnestify: Many thanks for the video! Highly recommended.

Though Debian 13 is mentioned to be released next week (August 9th (TBA)) we highly advise you to wait until upgrading your OS when running mailcow on it. Although we do not expect issues, please wait until official confirmation (following the week after the release).

Security Update 2025-07 is here. It is recommended to install this release as it fixes a Remote Code Execution (RCE) issue.

GitHub

Release 🔥🐄 Mooly Update 2025 | Security Update · mailcow/mailcow-dockerized

⚠️ Vulnerability fixed⚠️ This update addresses a critical vulnerability that allowed Remote Code Execution (RCE) by authenticated admin use...

Hello everyone! Update 2025-05 is now live:

GitHub

Release 💐🐄 Mooay 2025 Update | Identity Provider Improvements and Bug Fixes · mailcow/mailcow-dockerized

What's Changed Features feat(olefy): Allow disabling Olefy by @marvinruder in #6398 Allow additional domains in OAuth2 redirect URLs by @PseudoRes...

It contains some nice QoL fixes and general Bugfixes regarding the LDAP/OIDC patch.

Good Moorning! Minor Update 2025-03b has just released and brings some improvements for the base 2025-03 Update:

GitHub

Release 💮🐮 Moorch 2025 Update | The Update which changed the Cow | Revision B · mailcow/mailcow-dockerized

This minor release includes bug fixes for the 2025-03 release. CautionThe 2025-03 release contains breaking changes. Please read the changelog: htt...

Update 2025-03a is here!

GitHub

Release 💮🐮 Moorch 2025 Update | The Update which changed the Cow | Revision A · mailcow/mailcow-dockerized

This release includes only bug fixes for the 2025-03 release. CautionThe 2025-03 release contains breaking changes. Please read the changelog: http...

It contains some bug fixes regarding "The Update which changed the Cow" (LDAP/OIDC). If you already updated to 2025-03 before you should update to 2025-03a too.