550 5.7.1 Client host rejected: Your message was rejected due to spam filtering
2016/5/26 9:15:31 点击：
550 5.7.1 Client host rejected: Your message was rejected due to spam filtering
553 5.7.1 [BL21] Connections will not be accepted from 121.50.xx.xx because the ip is in Spamhaus's list
553 delivery from 121.50.xx.xx is rejected. The connecting IP is blocked using zen.spamhaus.org
550 #5.7.1 Your access to submit messages to this e-mail system has been rejected.
退信原因：发信服务器的IP在RBL黑名单
解决方案：IP被spamhaus列入了黑名单，可以直接去官网解封即可，只要你不是发垃圾邮件的机器，一般都是可以解封的，如果是发垃圾邮件的，整个段被SBL的，一般只有IP所有者跟他们联系，才能解封，网易邮箱220.181.0.0/20被全部黑名单，就是这样，只有北京电信跟他们联系，才能解封，私人是没法解封的
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