在linux服務器（CentOS release 6.6）上配置好了sendmail后，測試發送郵件時發現有問題，檢查sendmail服務的狀態，發現其處于“sendmail dead but subsys locked”， 檢查發現postfix服務也在運行。只需要將postfix服務停掉即可。為什么會出現這種情況呢？Something was occasionally causing the postfix service to start which then caused the status of sendmail to jump to dead but subsys locked. 兩種似乎不兼容。

操作步驟：

1：檢查sendmail服務的狀態

[root@DB-Server ~]# service sendmail status

sendmail dead but subsys locked

sm-client (pid 22112) is running...

2：檢查postfix服務的狀態

[root@DB-Server ~]# service postfix status

master (pid 1777) is running...

3：停止postfix服務

[root@DB-Server ~]# service postfix stop

Shutting down postfix: [ OK ]

4：重新啟動sendmail服務

[root@DB-Server ~]# service sendmail stop

Shutting down sm-client: [ OK ]

Shutting down sendmail: [FAILED]

[root@DB-Server ~]# service sendmail stop

[root@DB-Server ~]# service sendmail start

Starting sendmail: [ OK ]

Starting sm-client: [ OK ]

5：禁用postfix在reboot后自動啟動

檢查一下是否有設定 postfix 在 reboot 后自動啟動 chkconfig --list | grep postfix

chkconfig postfix off

參考資料：http://blog.chinaunix.net/uid-30212356-id-5081317.html