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Symantec Messaging Gateway: 501<**.**.**>is invalid or DNS says does not exist

  • 1.  Symantec Messaging Gateway: 501<**.**.**>is invalid or DNS says does not exist

    Posted Mar 27, 2014 10:56 PM

    收件人可以收到邮件，回复时smg会显示发送失败，详细信息是501<**.**.**>is invalid or DNS says does not exist，请问这个要应该怎么解决，谢谢。