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r u sending the message to a group? if yes then you need to remove that user from the group...
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r u sending the message to a group? if yes then you need to remove that user from the group...

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The user does not exist on any group, it is permanently removed from AD. &nbsp;It could be a locally cached offline address book issue. &nbsp;
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The user does not exist on any group, it is permanently removed from AD.  It could be a locally cached offline address book issue.  

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<a href="https://www.experts-exchange.com/questions/23197535/Offline-Address-Book-Outlook-2003-Cached-Mode.html" rel="ugc">https://www.experts-exchange.com/questions/23197535/Offline-Address-Book-Outlook-2003-Cached-Mode.html</a><br />
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see the mentioned tread you may have to clear your cached add book...
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https://www.experts-exchange.com/questions/23197535/Offline-Address-Book-Outlook-2003-Cached-Mode.html [https://www.experts-exchange.com/questions/23197535/Offline-Address-Book-Outlook-2003-Cached-Mode.html]

see the mentioned tread you may have to clear your cached add book...

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I keep getting the following error despite the fact this user does not exist on active directory or distribution list. &nbsp;please advise on how to correct.<br />
<br />
Your message did not reach some or all of the intended recipients.<br />
<br />
&nbsp; &nbsp; &nbsp; Subject: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Canceled: 1 - 2 - 1<br />
&nbsp; &nbsp; &nbsp; Sent: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14/06/2010 13:57<br />
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The following recipient(s) cannot be reached:<br />
<br />
&nbsp; &nbsp; &nbsp; Joe Bloggs on 14/06/2010 13:57<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; The e-mail account does not exist at the organization this message was sent to. &nbsp;Check the e-mail address, or contact the recipient directly to find out the correct address.<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;tcg.internal.change.com #5.1.1&gt;<br />

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I keep getting the following error despite the fact this user does not exist on active directory or distribution list.  please advise on how to correct.

Your message did not reach some or all of the intended recipients.

      Subject:	Canceled: 1 - 2 - 1
      Sent:	14/06/2010 13:57

The following recipient(s) cannot be reached:

      Joe Bloggs on 14/06/2010 13:57
            The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.
            <tcg.internal.change.com #5.1.1>


The following recipient(s) cannot be reached

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Microsoft server applications are those applications developed specifically, but not necessarily exclusively, on the Windows Server platform. In addition to well-known products like SQL Server, Exchange, Internet Information Services (IIS), Microsoft Dynamics, Forefront, Lync and Sharepoint, they include applications like Skype, BizTalk, Hyper-V, Groove and Commerce Server. Server applications are managed with the Microsoft System Center.