After using the forum for some time, I realized that I really do not find it a convincing solution for communication. I usually follow discussions reading emails during idle time on the phone and with the current solution I just get one message and have to read the rest in the browser. I did not find an option where I could change this behaviour.
Discourse looks pretty good, so +1 from my side for exploring this option further. Using the mailing list would be fine for too, but discourse would probably give a much better experience for the "end user".
Installing Discourse is beyond the scope of my server's management framework.
@Niko: Will you take care of this?
As their default way for installing is using docker and I am using docker as a basis for all services at the new alpha.openseamap I can create a instance of Discourse easily.