I get the following mail every day:
I searched for this error and found a fix by applying the following fix: https://unix.stackexchange.com…bounce-of-smtputf8-emails
Because openmediavault is managing the `main.cf` of postfix, I cannot apply the fix directly in the config.
I found the following thread touching the same topic. But it seems this is still an old mkconfig fix:
What's the best way of applying custom config entries for postfix with OMV 5?