Running dovecot proxy as different user

[Marc Roos]

I thought, I read somewhere I could prevent chroot with[1] but I am 
still getting chroot errors[2]. 

drwxrwxr-x 2 10053   101  6 Dec  2 16:54 empty
drwxr-x--- 2 10053   101 73 Dec  2 17:00 login
drwxr-x--- 2 10053   101 44 Dec  2 17:00 token-login

[1]
service anvil {
  chroot =
}

[2]
Dec  2 17:07:07 c04 dovecot: stats: Fatal: chroot(/var/dovecot/empty) 
failed: Operation not permitted
Dec  2 17:07:07 c04 dovecot: master: Error: service(stats): command 
startup failed, throttling for 16 secs
Dec  2 17:07:07 c04 dovecot: pop3-login: Fatal: setgid(101(dovenull)) 
failed with euid=10053(dovecot), gid=10053(dovecot), 
egid=10053(dovecot): Operation not permitted (This binary should 
probably be called with process group set to 101(dovenull) instead of 
10053(dovecot))
Dec  2 17:07:07 c04 dovecot: master: Error: service(pop3-login): command 
startup failed, throttling for 16 secs