邮件系统从内部给外部邮箱发信，遭到退信。退信消息如下：
554 5.4.4 SMTPSEND.DNS.NonExistentDomain; nonexistent domain
现在内外部邮件发送正常，出现退信情况只针对一个后缀名的邮箱。
请问这个问题改如何解决？谢谢！
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