Postfix退信：Sender address rejected: not logged in

最近遇到退信，退信內容為Sender address rejected: not logged in，長的像下面這樣子
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A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

   jock@tainet.com

    SMTP error from remote mail server after RCPT TO:<jock@tainet.com>:

    host mail.tainet.com [201.175.38.27]: 553 5.7.1 <jock@tainet.com>:

    Sender address rejected: not logged in

 ------ This is a copy of the message, including all the headers. ------

 Return-path: <jock@tainet.com>

Received: from [201.175.38.27] (port=54382 helo=tainet.com)

        by seed.net.tw with smtp (Seednet 4.67:1)

        id 1WISvi-000FED-7a

        for jock@tainet.com; Wed, 23 Feb 2014 07:15:03 +1200
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檢查後發現為其它非該網域的郵件主機，未經過postfix驗證，而寄信到相同網域，造成類似仿冒垃圾信，而被postfix給阻攔退件，但退件的Return-Path又是同一個sender address，就會有上面的訊息出現，假設某些原因，需讓其它郵件主機發信到真的是該網域的負責的郵件主機收信的話，可利用白名單的方式跳過Spam檢查
Step 1：
#vi /etc/postfix/rbl_whitelist
18.122.33.34 OK
192.168.1.100 OK
passmail.domain.com OK
test.domain.com OK
Step 2：
存檔後執行#postmap /etc/postfix/rbl_whitelist
Step 3
#vi /etc/postfix/main.cf
找到smtpd_sender_restrictions，然後在reject_sender_login_mismatch前面加入白名單設定check_client_access hash:/etc/postfix/rbl_whitelist, 後存檔

Step 4：
重啟服務# /etc/init.d/postfix restart
白名單便可生效，跳過Sender address rejected: not logged in造成的退信問題
PS：造成阻攔的原因是postfix有使用reject_sender_login_mismatch這個參數的原因