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Also check message tracking and see what is going on.
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Also check message tracking and see what is going on.

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I &nbsp;have a end user complaining about not getting email , the last time he got a email was last night at 1730 and it was from outside the company. what could be causing this ?<br />
this is the message that a external user would get when he attempted to send the user a email<br />
&nbsp;&quot;A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients. &nbsp;Contact your administrator&quot; I have &nbsp;sent him a test email and not gotten anything back yet 
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I  have a end user complaining about not getting email , the last time he got a email was last night at 1730 and it was from outside the company. what could be causing this ?
this is the message that a external user would get when he attempted to send the user a email
 "A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients.  Contact your administrator" I have  sent him a test email and not gotten anything back yet 

A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients.  Contact your administrator

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

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.

Exchange

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.