/etc/dovecot$ sudo service dovecot status -l
● dovecot.service - Dovecot IMAP/POP3 email server
   Loaded: loaded (/lib/systemd/system/dovecot.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2015-12-22 00:05:14 CET; 7min ago
  Process: 16629 ExecStart=/usr/sbin/dovecot -F (code=exited, status=89)
 Main PID: 16629 (code=exited, status=89)

Dec 22 00:05:14 ares systemd[1]: Started Dovecot IMAP/POP3 email server.
Dec 22 00:05:14 ares dovecot[16629]: doveconf: Fatal: Error in configuration file /etc/dovecot/conf.d/auth-sql.conf.ext line 7: Unknown setting: connect
Dec 22 00:05:14 ares systemd[1]: dovecot.service: Main process exited, code=exited, status=89/n/a
Dec 22 00:05:14 ares systemd[1]: dovecot.service: Unit entered failed state.
Dec 22 00:05:14 ares systemd[1]: dovecot.service: Failed with result 'exit-code'.

passdb {
  driver = sqlite
  connect = /etc/postfix/postfix.sqlite

  password_query = SELECT name AS username, domain, password FROM users WHERE name || '@' || domain = '%u' AND enabled = '1'
  iterate_query = SELECT name AS username, domain FROM users AND enabled = '1'

  # Path for SQL configuration file, see example-config/dovecot-sql.conf.ext
  #args = /etc/dovecot/dovecot-sql.conf.ext
}