Yes, I saw the DKIM=fail at the first time, but debian said, it is the fault of megamailservers.eu and theire servers are ok.
So I contacted megamailservers.eu today, but generally I can do nothing else myself, as I am no admin of any involved mailservers. So, hopefully they will answer. IMO something is wrong, or let's say, soemthing is not working as I expect it. At the moment I have no further clue. So, we will wait. Lets stop for now. But thanks for the help and your time! Best Hans
