I’ve setup the graylog external logging in the past and everything was working in the past.
Not needed the logs for some time and today when asking myself what is going on in the “back” i see that graylog didn’t received anything from mailcow server since 06 february 😐
there is no connectivity issue, both servers (mailcow and graylog) are running latest version of software on ubuntu 20.
the external logging was done via docker-compose.override.yml:
postfix-mailcow: # or any other