postfix 2.10+ 邮件转发问题

最近发邮件一直有这个错误

Apr 12 18:59:04 ZaphodBeeblebrox postfix/smtpd[10669]: NOQUEUE: reject: RCPT from mail.elmarotter.eu[83.161.154.53]: 554 5.7.1 : Relay access denied; from= to= proto=ESMTP helo=<[192.168.0.16]>

后来查看了不少文档, 发现是postfix 升级到 2.10.0的问题,

2.10的release中增加了

smtpd_relay_restrictions

* COMPATIBILITY: adding smtpd_relay_restrictions to main.cf
* to prevent inbound mail from unexpectedly bouncing.
* Specify an empty smtpd_relay_restrictions value to keep using
* smtpd_recipient_restrictions as before.

在/etc/postfix/main.cnf中加上

smtpd_relay_restrictions = permit_mynetworks,permit_sasl_authenticated,defer_unauth_destination
就能解决这个问题。