网上找了一下资料 估计是DNS的配置有问题
重新修改DNS = 8.8.8.8
然后重启服务 /etc/init.d/network restart
重新发送邮件
Notify.test_email('xxxxx@qq.com', '邮件标题_test', '邮件正文_test').deliver_now
OK，解决了
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