Sending an Email message from a web form

I used pretty typical code copied from an example:

Dim MailMsg As New MailMessage
MailMsg.To = ""
MailMsg.Subject = TextBoxSubject.Text
MailMsg.Body = TextBoxMessageText.Text
MailMsg.From = TextBoxAddr.Text
SmtpMail.SmtpServer = "localhost"
SmtpMail.SmtpServer = ""

I am on a home PC, with DSL provider Verizon.  Outlook is working for me to send/receive mail.

When i tried SmtpMail.SmtpServer= "localhost", i got the following exception:
The server rejected one or more recipient addresses. The server response was: 550 5.7.1 Unable to relay for
[where xxx was my valid, correct Email address].

When i tried SmtpMail.SmtpServer= "", i got the following exception:
The server rejected the sender address. The server response was: 550 5.7.1 Authentication Required
[Note, "" is what "outgoing mail server (SMTP)" is configured to in Outlook under Tools...Email Accounts].

Can anybody show me how to write this web form to send the message?  For instance is there some other authentication information i need to send, and if so, what is the code that would allow me to do it?  Or, is there some other system configuration i need to do on this PC for instance?

Thank you.  Tom

10/13/2005 8:16:18 PM 93655 articles. 5 followers. Follow

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Is there any reason you are specifying an SmtpServer?

From the SDK:

Property Value

The name of the e-mail relay server. If SmtpServer is not set, the name of the local SMTP server is used.


If your local SMTP server (included with Windows 2000 and Windows Server 2003) is behind a firewall that blocks any direct SMTP traffic (through port 25), you will need to find out if there is a smart host available on your network that is allowed to relay SMTP messages to the Internet.

A smart host is an SMTP server with the permissions to relay outgoing e-mail messages directly to the Internet from internal SMTP servers. A smart host should be able to simultaneously connect to both the internal network and the Internet in order to work as the e-mail gateway.

For information about configuring your local SMTP server, see the articles "Manage Your Company's E-mail with the Windows 2000 SMTP Service" and "Using SMTP for Outgoing Messages" in the MSDN library at

10/13/2005 9:53:41 PM

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