sending mail via System.Net.Mail.SmtpClient

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Bill H - 14 Jul 2006 20:08 GMT

I am able to send an thru our mail server using the old 1.1
System.Web.Mail.SmtpMail class.

When I try sending an email using the new System.Net.Mail.SmtpClient, I get
a #5.5.1 unimplemented error: Command Not Implemented

The code is nearly identical and the server is the same.

Any ideas what is different ?

Thanks
Bill

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Bill H - 14 Jul 2006 20:25 GMT

also, our mail server uses qMail.

>I am able to send an thru our mail server using the old 1.1
>System.Web.Mail.SmtpMail class.
[quoted text clipped - 8 lines]
> Thanks
> Bill

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Eugene Mayevski - 14 Jul 2006 20:35 GMT

Hello!
You wrote on Fri, 14 Jul 2006 15:25:49 -0400:

??>> Any ideas what is different ?

It is possible (just a guess) that .NET switched from sending HELO to
sending EHLO command and EHLO is not supported by your server.
What you can do is connect using telnet to the server and send "EHLO
blah-blah". And see whether the server supports it.

With best regards,
Eugene Mayevski
http://www.SecureBlackbox.com - the comprehensive component suite for
network security

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Kevin Spencer - 15 Jul 2006 12:25 GMT

This is in fact the case. See the following MS KB article, which mentions a
HotFix that can be obtained from Microsoft:

http://support.microsoft.com/?kbid=913616

Signature

HTH,

Kevin Spencer
Microsoft MVP
Professional Chicken Salad Alchemist

What You Seek Is What You Get.

> Hello!
> You wrote on Fri, 14 Jul 2006 15:25:49 -0400:
[quoted text clipped - 10 lines]
> http://www.SecureBlackbox.com - the comprehensive component suite for
> network security

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