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A Hotfix is a product update package with one or more updated product files that fix a specific product problem.


Please be aware this Hotfix has not gone through full Microsoft product regression testing nor has it been tested in combination with other Hotfixes.

Please carefully review the associated Hotfix KB article to verify the fix is the one needed and there are no known compatibility or installation issues. You may also want to contact a Microsoft Support Professional at

Issue Description

KB913616 FIX: Error message when you try to send e-mail by using the System.Net.Mail.SmtpClient class in a Visual Studio 2005-based application

Consider the following scenario. In a Microsoft Visual Studio 2005 based application, you try to send e-mail by using the System.Net.Mail.SmtpClient class. You use the DeliveryMethod.Network method from the Microsoft .NET Framework 2.0. In this scenario, you may receive the following System.Net.Mail.SmtpException error message:
Command not implemented. The server response was: Command not Supported.

This problem occurs because the remote SMTP server does not support the SMTP extended Hello (EHLO) command. The exception occurs when the remote SMTP server returns the 502 reply code and the System.Net.Mail.SmtpClient class expects the 500 reply code.

Additional Information about the issue resolved by this Hotfix can be found in its Knowledge Base article at

Additional Hotfixes
Search the list of all other publicly available Visual Studio and .NET Framework Hotfixes at*
Last edited Jun 23 2008 at 8:44 PM  by codegalleryadmin, version 4
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