553-you are trying to use me [server-15.tower-188.messagelab 553-s.com] as a relay

2016/10/18 11:08:22      点击:
553-you are trying to use me [server-15.tower-188.messagelab
553-s.com] as a relay, but I have not been configured to
553-let you [xx.xx.xx.xx, xx.xx.net] do this.
553-Please visit www.symanteccloud.com/troubleshooting for
553-more details about this error message and instructions

553 to resolve this issue. (#5.7.1)

退信原因:收信人域名不在连接的机器上,对方拒绝中继。其实直接来个relay access denied就懂了,赛门铁克的说明也太详细了。

解决方案:收信客户的域名esprit.com原来使用的是赛门铁克的云反垃圾网关,后来客户自己架设邮局,使用了微软的软件。我们通过查询域名的MX记录,发现指向了esprit-com.mail.protection.outlook.com通过查询A记录,可以找到邮局的IP地址是213.199.154.23和213.199.154.87。而这里退信连接的机器IP是85.158.139.163,显然是不对的了,通过更新中继服务器的DNS缓存,问题搞定。

相关的连接如下:https://support.symantec.com/en_US/cloud/troubleshooting.64305.html