The mailserver suite with the 'moo' | Official mailcow mastodon Account | ONLY News/Announcements! NO SUPPORT HERE!
⚠️ Heads-up for mailcow admins:
OS upgrades may install Docker Compose 5.x, which mailcow can run with, but the update script won’t work unless refreshed once.
Fix:
Check your Compose version. If it shows 5.x, you’re affected.
In your mailcow directory: git fetch
Then: git checkout origin/master update.sh
Without this tasks , you can’t update mailcow unless you downgrade Compose to v2 which is harder than running these steps :)
If you still use compose v2 your good to go, simply run an update
We are sad to announce the leave of DerLinkman as maintainer of the mailcow project. The mailcow project however will continue as normal.
Read more here:
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:
Update 2026-03 is here!
https://github.com/mailcow/mailcow-dockerized/releases/tag/2026-03
Release 2025-12a is here:
https://github.com/mailcow/mailcow-dockerized/releases/tag/2025-12a
It contains some smaller fixes brought with 2025-12 (e.g. improved backup script handling regarding docker image pulls) and some more.
Moohoo! Update 2025-10 has just been released:
https://mailcow.email/posts/2025/release-2025-10/
This update addresses the critical CVE-2025-49844 affecting Redis.
While the exploit was not exposed in mailcow environments, updating is still strongly recommended.
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: https://www.youtube.com/watch?v=fgEWUsYPd9M
Many thanks for the video! Highly recommended.
Release 2025-09b is here.
This update fixes startup issues with the NGINX container when IPv6 is disabled.
https://github.com/mailcow/mailcow-dockerized/releases/tag/2025-09b
@mschuster@social.tchncs.de If you do backups, yes. You can always only upgrade to the latest version directly not partially.
@rfrering@mastodon.social @SOGo@floss.social @fosdem@fosstodon.org
Cloudfest most likely as seen this year 🤫 But not guaranteed yet.
@SOGo@floss.social Looks nice, good job so far!
@mliertzer@hachyderm.io Thanks! Will update the guide accordingly.