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.

A new Blogpost is also available here:

https://mailcow.email/posts/2025/release-2025-12/

Update 2025-12 is here, just another bugfix update.

Before you update, please make sure to read the important message in the release tab first.

https://github.com/mailcow/mailcow-dockerized/releases/tag/2025-12

⚠️ 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

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.

@rfrering @SOGo @fosdem

Cloudfest most likely as seen this year 🤫 But not guaranteed yet.

@SOGo Looks nice, good job so far!

Dear Community,

We’d like to share some updates about SOGo V6!
Earlier this year, we announced our goal of redesigning SOGo

What to expect with SOGo 6 ?
- A modern and intuitive user interface.
- A new administration console that replaces the configuration file.
- Practical features, such as scheduling emails or canceling a message a few seconds after sending.

For more details or to follow the project’s progress, visit the official SOGo website 👉 https://www.sogo.nu/news/2025/sogo-v6-septembre.html

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

Revision A (2025-09a) is here:
https://github.com/mailcow/mailcow-dockerized/releases/tag/2025-09a

Update 2025-09 is here:
https://github.com/mailcow/mailcow-dockerized/releases/tag/2025-09

Please read the changelog carefully before upgrading!

@yawnbox From who?

@mschuster Yes 🙌

mailcow now also validates MTA-STS when sending to domains that support it. DANE remains the preferred method if the destination domain is compatible.

Starting with Update 2025-08: Configure MTA-STS directly in the mailcow UI. The required DNS records will be shown in the DNS checker tool too. #mailcow #teaser

@mliertzer Thanks! Will update the guide accordingly.

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:

https://mailcow.email/posts/2025/upgrade-deb12-to-deb13/

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.

mailcow internal container updates (Bookworm (12) -> Trixie (13)) will follow at earliest by the end of this year, more likely during the first half of 2026.

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).