这是因为防火墙或者配置文件导致，无法启动的邮件服务！！
首先关闭防火墙！
修改配置文件
vim /etc/postfix/main.cf
inet_protocols = ipv4
inet_interfaces = all
这样就可以启动服务了，看效果图（如下图所示）
Job for postfix.service failed because the control process exited with error code. See "systemctl status postfix.service" and "journalctl -xe" for details.
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See "systemctl status postfix.service" and "journalctl -xe" for details.
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