[Dovecot] localhost deliver(root at vlocalhost): setgid(5001) failed with euid=8, gid=8, egid=8: Operation not permitted

[Gert Cuykens]

a thank you :) Now i learned something really important today

chmod u+s /usr/lib/dovecot/deliver

root at localhost:~# ls -al /usr/lib/dovecot/deliver
-rwsr-xr-x 1 root root 563112 2008-03-31 21:05 /usr/lib/dovecot/deliver
root at localhost:~#

I think i am almost there but now i get

Apr 12 19:01:40 localhost deliver(root at vlocalhost): postmaster_address
setting not given