root@mail:~# dovecot -n
# 2.2.9: /etc/dovecot/dovecot.conf
# OS: Linux 3.19.0-30-generic x86_64 Ubuntu 14.04.3 LTS
disable_plaintext_auth = no
mail_location = maildir:~/Maildir
passdb {
  args = session=yes cache_key=%s%u dovecot
  driver = pam
}
protocols = pop3 imap
service imap-login {
  inet_listener imap {
    port = 143
  }
}
ssl = no
userdb {
  driver = passwd
}