Jun 01 15:32:02 formolibre dovecot[7183]: doveconf: Fatal: Error in configuration file /etc/dovecot/conf.d/10-master.conf line 106: Unknown setting: service
Jun 01 15:32:02 formolibre dovecot[6913]: master: Warning: Killed with signal 15 (by pid=7186 uid=0 code=kill)
Jun 01 15:32:02 formolibre dovecot[7183]: Stopping IMAP/POP3 mail server: dovecot.
Jun 01 15:32:02 formolibre dovecot[7190]: doveconf: Fatal: Error in configuration file /etc/dovecot/conf.d/10-master.conf line 106: Unknown setting: service
Jun 01 15:32:02 formolibre dovecot[7190]: Starting IMAP/POP3 mail server: dovecotdoveconf: Fatal: Error in configuration file /etc/dovecot/conf.d/10-master.conf line 106: Unknown setti
Jun 01 15:32:02 formolibre dovecot[7190]: failed!


so i comment

#service auth-worker {
  # Auth worker process is run as root by default, so that it can access
  # /etc/shadow. If this isn't necessary, the user should be changed to
  # $default_internal_user.
  #user = root
#}

#service dict {
  # If dict proxy is used, mail processes should have access to its socket.
  # For example: mode=0660, group=vmail and global mail_access_groups=vmail
#  unix_listener dict {
    #mode = 0600
    #user =
    #group =
#  }
#}