Postfwd not starting at startup

[Ralf Mardorf]

If the provided systemd unit doesn't work, you can write your own unit
or use another workaround based on the hints provided by
https://github.com/postfwd/postfwd , but I guess you don't need to do
this. What's the output of

systemctl status postfwd.service

?

What's the content of the original package's file
/usr/lib/systemd/system/postfwd.service ?

Force a reinstall, then run

cat /usr/lib/systemd/system/postfwd.service

and post the output.