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/etc/postfix/main.cf

smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noplaintext,noanonymous
smtpd_sasl_tls_security_options = noanonymous
smtpd_sasl_path = private/auth
smtpd_sasl_type = dovecot
queue_directory = /var/spool/postfix

smtpd_tls_cert_file = /etc/apache2/ssl/valami.hu/cert.pem
smtpd_tls_key_file = /etc/apache2/ssl/valami.hu/key.pem
smtpd_tls_security_level = may
smtpd_tls_auth_only = yes
smtpd_tls_mandatory_ciphers = high
smtpd_tls_mandatory_exclude_ciphers = aNULL,MD5
smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
smtpd_starttls_timeout = 300s

/etc/dovecot/dovecot.conf

service auth {
  executable = /usr/lib/dovecot/auth
  user = root
  unix_listener auth-userdb {
    #mode = 0666
    #user =
    #group =
  }

  # Postfix smtp-auth
  unix_listener /var/spool/postfix/private/auth {
    mode = 0666
    user = postfix
    group = postfix
  }
}