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smtp;450 4.7.1 Client host rejected: cannot find your hostname

Posted on 2008-11-12
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Last Modified: 2012-05-05
When sending an email to a user, I get the following NDR

You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <mailserver.mydomainname.com #4.7.1 smtp;450 4.7.1 Client host rejected: cannot find your hostname, [My Mail Public IP]>
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Question by:Ali_Aamer
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Ali_Aamer earned 0 total points
ID: 22948623
Added Reverse DNS entry to the public IP of my mail server by contacting the ISP.   Solved the problem.
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