postfix無法啓動，查看日誌，發現日誌提示master.cf文件109行有問題，打開文件一看109行是註釋啊，怎麼回事？日誌如下：
tail -f /var/log/maillog Aug 18 15:56:11 localhost postfix/postfix-script[11639]: starting the Postfix mail system Aug 18 15:56:11 localhost postfix/master[11640]: fatal: /etc/postfix/master.cf: line 109: bad transport type: user=vuser /etc/postfix/master.cf: line 109: bad transport type: user=vuseAug 18 15:58:20 localhost postfix/postfix-script[11656]: fatal: the Postfix mail system is not running
仔細一看是因爲配置的maildrop第二行開頭沒有空格，加上之後，重啓服務就好了。
maildrop unix - n n - - pipe
68 flags=DRhu user=vuser argv=maildrop -w 90 -d ${user}@${nexthop} ${recipient} ${user} ${extension} {nexthop}