163经销代理服务商：深圳市阔步实业有限公司

554-xxx.xxxx.com
554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.

554-xxx.xxx.xxxx.com
554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.
退信原因：IP在RBL黑名单中导致退信

解决方案：检查IP黑名单问题，发现IP进入了spamhaus的PBL黑名单了，解封了IP地址，因为DNS更新需要点时间，一般过半个小时即可发送过去。spamhaus目前是全球使用最多的黑名单组织，一般只要在它那里是SBL或者PBL，大部分的邮局都会拦截你的邮件。