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I have some users that have gotten the following NDR and I am a little confused as to what it means. &nbsp;&quot;There was an SMTP communication problem with the recipient's email server. &nbsp;Please contact your system administrator. &nbsp;&lt;tweety.umpublishing.org #5.5.0 amtp;503 5.5.0 Not accepting any command except QUIT&gt;&quot;<br />
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It's that not accecpting any command part that has me confused.
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I have some users that have gotten the following NDR and I am a little confused as to what it means.  "There was an SMTP communication problem with the recipient's email server.  Please contact your system administrator.  <tweety.umpublishing.org #5.5.0 amtp;503 5.5.0 Not accepting any command except QUIT>"

It's that not accecpting any command part that has me confused.

Questionable NRD

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.