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The following recipient(s) could not be reached:<br />
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&nbsp; &nbsp; &nbsp;USER on 05/15/2009 9:38 AM<br />
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&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; There was a SMTP communication problem with the recipient's email server. &nbsp;Please contact your system administrator.<br />
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&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;server.com #5.5.0 smtp;501 Bad message size syntax&gt;<br />

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The following recipient(s) could not be reached:

     USER on 05/15/2009 9:38 AM

            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.

            <server.com #5.5.0 smtp;501 Bad message size syntax>


The following recipient(s) could not be reached: Bad message size syntax

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.