550 Denied by policy
550 Denied by policy今天一个客户用了中继，却出现这个退信，邮件已经投递到对方服务器但是为什么还会退信呢，客户不明白用了中继怎么还会退信。其实退信要分3种情况，今天就普及一下知识，首先要看服务器是自己服务器退的，还是中继服务器退的，还是对方客户服务器退的。从下面来看邮件是已经投递到对方但是给了退信，并且是对方拒绝了从退信内容看我们经过欧美的三轮服务器投递都失败由此不是ip的问题，而是对方近期调整了反垃圾策略，所以只能建议请更换主题和内容既可以。重新试过之后邮件果然成功并且 回复了。如果海外退信就选择Relaypod™(锐利)电邮的邮件中继吧！
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