1、测试发送邮件：echo'test'|mail-s'test' xxx@qq.com
2、查看postfix状态：servicepostfixstatus
3、重启sendmail：/etc/init.d/sendmailrestart
4、安装mutt：yum install-ymutt
5、安装mail：yuminstall-ymail
6、停止postfix：servicepostfixstop
7、安装sendmail：yuminstall-ysendmail
8、启动sendmail：/etc/init.d/sendmailstart
9、查看sendmail状态：/etc/init.d/sendmailstatus