MSDN Archive Home
Help and FAQs
KB913616 - Error message when you send e-mail using System.Net.Mail.SmtpClient
All Resource Updates
Change History (all pages)
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
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
Search the list of all other publicly available Visual Studio and .NET Framework Hotfixes at
Jun 23 2008 at 8:44 PM
, version 4
Sign in to add a comment
Mon Jun 18 2007 at 7:00 AM
More Tags ...
Visual Studio 2005
Visual Studio 2008
Visual Studio 2010
Manage Your Profile
MSDN Flash Newsletter
© 2008 Microsoft Corporation. All rights reserved.