公司使用postfix 當作郵件主機，目前想詢問一個問題為：同封信件在postfix maillog上有兩組Message ID，記憶中應該是一封信件只會有一組Message ID才對；以下提供log供各位查看。

[root@mail ~]# grep AC03F46003F /var/log/maillog
Mar 3 15:39:40 mail postfix/smtpd[6952]: AC03F46003F: client=ms.colatour.com.tw[219.87.13.253]
Mar 3 15:39:40 mail postfix/cleanup[6955]: AC03F46003F: message-id=<1393830305.32247.example@colatour.com.tw>
Mar 3 15:39:42 mail postfix/qmgr[4105]: AC03F46003F: from=<example@colatour.com.tw>, size=2863431, nrcpt=1 (queue active)
Mar 3 15:39:42 mail postfix/pipe[6956]: AC03F46003F: to=<example@abc.com>, relay=dfilt, delay=2.3, delays=2.1/0/0/0.14, dsn=2.0.0, status=sent (delivered via dfilt service)
Mar 3 15:39:42 mail postfix/qmgr[4105]: AC03F46003F: removed

[root@mail ~]# grep 6E719460055 /var/log/maillog
Mar 3 15:39:42 mail postfix/pickup[6778]: 6E719460055: uid=102 from=<example@colatour.com.tw>
Mar 3 15:39:42 mail postfix/cleanup[6955]: 6E719460055: message-id=<1393830305.32247.example@colatour.com.tw>
Mar 3 15:39:42 mail postfix/qmgr[4105]: 6E719460055: from=<example@colatour.com.tw>, size=1573, nrcpt=1 (queue active)
Mar 3 15:39:51 mail postfix/local[7031]: 6E719460055: to=<example@abc.com>, relay=local, delay=8.7, delays=0.11/0/0/8.6, dsn=2.0.0, status=sent (delivered to command: /usr/bin/procmail)
Mar 3 15:39:51 mail postfix/qmgr[4105]: 6E719460055: removed