After update to version 2025-09 tls problems

Ckruijntjens

Hi All,

After upgrade i see some tls problems.

02BADFABBE: to=, relay=none, delay=0.07, delays=0.05/0.01/0/0, dsn=4.7.5, status=deferred (delivery temporarily suspended: client TLS configuration problem)

When reverting back to earlier mailcow version all is working again.

Ckruijntjens

Already found the problem.

Because of the new container postfix-tlspol-mailcow i got a dns problem. from this container dns was not reachable.

added the dns dor this container in the override file now its working again.

rezzorix

So is this a general problem or specific to your setup..?

Ckruijntjens

rezzorix

i Think with my setup. Because of my dns setup. I override the dns server for all docker containers. Because of the new container in this version it did not know the dns setting.

That was why there was a problem.

Matthias

Hello everyone,
I also have this problem and would like to know where I can update the DNS settings.
I’m currently experiencing this issue with @web.de domains, but I’m not sure if others are affected as well.
What exactly do I need to do in which directory?

Ckruijntjens

Matthias

Hi,

You can create a file “docker-compose.override.yml”

Inside this file you can set you override options. So for me the overwrite settings for the new container is.

postfix-tlspol-mailcow: dns: - 192.168.2.1

This is an example for you.

Matthias

Hi,
Thank you for your reply.
I found the problem in my case. There was a faulty configuration of Postfix Dane.
This page helped me fix the configuration:
https://doku.lrz.de/dane-ausgehend-mit-postfix-einrichten-11497214.html

After restarting the Postfix container, it now works perfectly.

Thank you and best regards