1、查看sendmail状态：

# service sendmail status

sendmailsendmail.service - LSB: start and stop sendmail

 Loaded: loaded (/etc/rc.d/init.d/sendmail)

 Active: active (running) since Mon, 14 Jan 2013 11:30:09 +0800; 8min ago

Process: 1231 ExecStart=/etc/rc.d/init.d/sendmail start (code=exited, status=0/SUCCESS)

Main PID: 1410 (sendmail)

 CGroup: name=systemd:/system/sendmail.service

 ├ 1410 sendmail: accepting connections

 └ 1419 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue

sm-clientsendmail.service - LSB: start and stop sendmail

 Loaded: loaded (/etc/rc.d/init.d/sendmail)

 Active: active (running) since Mon, 14 Jan 2013 11:30:09 +0800; 8min ago

Process: 1231 ExecStart=/etc/rc.d/init.d/sendmail start (code=exited, status=0/SUCCESS)

Main PID: 1410 (sendmail)

 CGroup: name=systemd:/system/sendmail.service

 ├ 1410 sendmail: accepting connections

 └ 1419 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue

2、关闭sendmail，禁止开机启动：

# service sendmail stop

Shutting down sm-client: [OK]

Shutting down sendmail: [OK]

注：service命令虽然已经关掉了sendmial服务，但是在下次重新启动OS的时候，还是会随OS启动而启动。

# chkconfig --listsendmail

sendmail        0:off   1:off   2:on    3:on    4:on    5:on    6:off

可以看到在启动模式2/3/4/5都是默认启动的，全部禁止：

# chkconfig --level 2 sendmail off

# chkconfig --level 3 sendmail off

# chkconfig --level 4 sendmail off

# chkconfig --level 5 sendmail off

（以上命令可以用# chkconfig --levels 2345 sendmail off替代）

# chkconfig --list sendmail

sendmail        0:off   1:off   2:off   3:off   4:off   5:off   6:off

# setup

中sendmail前面[]中的*也没有了。