阿里云由于安全问题，禁用了 25 端口，无法对外发送邮件
登录 QQ 邮箱
设置–>账号–>POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV 服务中 IMAP/SMTP 服务–>开启–>获得第三方登录密码
安装邮件服务
yum install -y mailx sendmail
创建证书
mkdir -p /root/.certs/
echo -n | openssl s_client -connect smtp.qq.com:465 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > ~/.certs/qq.crt
certutil -A -n "GeoTrust SSL CA" -t "C,," -d ~/.certs -i ~/.certs/qq.crt
certutil -A -n "GeoTrust Global CA" -t "C,," -d ~/.certs -i ~/.certs/qq.crt
certutil -L -d /root/.certs
信任证书
cd ~/.certs
certutil -A -n "GeoTrust SSL CA - G3" -t "Pu,Pu,Pu" -d ./ -i qq.crt
配置/etc/mail.rc
vi /etc/mail.rc
修改值
set smtp="smtps://smtp.qq.com:465"
set smtp-auth=login
set smtp-auth-user="[email protected]"
set smtp-auth-password="授权密码"
set ssl-verify=ignore
set nss-config-dir=/root/.certs
不需要重启什么服务，发送邮件
echo message3 | mail -v -r "[email protected]" -s "hello world" [email protected]
-v 打印详细信息
