卸载sendmail和postfix
yum -y remove sendmail postfix
安装mailx
yum -y install mailx
配置mail.rc
vim /etc/mail.rc
set from=发送邮件的邮箱
set smtp=smtp.163.com
set smtp-auth-user=用户名也可以写邮箱
set smtp-auth-password=授权码或密码
set smtp-auth=login
发送邮件
echo "邮件内容" | mailx -v -s "邮件标题" 目标邮箱地址
