postfix寄信認證改用dovecot

一直以來我都讓postfix使用 sasl 方式處裡寄信認證, 但是連結到多網域主控伺服器的時候, 就會出錯, 很麻煩.
經過測試 dovecot 可以使用多組 userdb , 與passdb , 達到一個mail server 支援多個ldap網域主控.

當然也能省下一個sasl的service

• 修改dovecort的 conf.d/10-master.conf

service auth {
...
  unix_listener /var/spool/postfix/private/auth {
    mode = 0660
    # Assuming the default Postfix user and group
    user = postfix
    group = postfix
  }
  ...
}

#以下設定為了相容outlook系統
auth_mechanisms = plain login

• 修改postfix的main.cf

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth

# On Debian Wheezy path must be relative and queue_directory defined
#queue_directory = /var/spool/postfix

# and the common settings to enable SASL:
smtpd_sasl_auth_enable = yes

• 修改postfix的master.cf

submission inet n - n - - smtpd
  -o smtpd_tls_security_level=encrypt
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_sasl_type=dovecot
  -o smtpd_sasl_path=private/auth
  -o smtpd_sasl_security_options=noanonymous
  -o smtpd_sasl_local_domain=$myhostname
  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
  -o smtpd_sender_login_maps=hash:/etc/postfix/virtual
  -o smtpd_sender_restrictions=reject_sender_login_mismatch
 ...

參考:

https://doc.dovecot.org/configuration_manual/howto/postfix_and_dovecot_sasl/