could be a number of reasons. Do you not get any errors Which version of .NET Framework are you using if you are using .NET 2.0 use the System.Net.Mail namespace and classes.

you may need to provide credentials to the Smtp class in order to authenticate. You also dont need a .ToString() at the end of your From and To properties

Use SmtpClient. Here's very simple example

SmtpClient client = new SmtpClient("www.foo.com");
com", "Friendly Dog");
");
MailMessage message = new MailMessage(from, to);
message.Body = "This is some HTML text <a href=\"www.foo.com\">FOO</a>";
message.Subject = "You are invited";
message.IsBodyHtml = true;
client.Send(message);
message.Dispose();

www.foo.com should be your SMTP host server

Here's a link about how to setup SMTP on IIS

http://msdn2.microsoft.com/en-us/library/8b83ac7t(vs.80).aspx

and more complete code sample

http://msdn2.microsoft.com/en-us/library/system.net.mail.smtpclient.aspx

if this works in a web app but not a winform app, one thing does come to mind - your anti virus software. Some do block sending emails from an application, others wait until the application is closed to send the email. I would also check to see if in your junk email inbox has those emails incase if it filters it out.

The way I did it in a WinForm app in .NET 2003 was simply to add a reference to System.Web then import the namespace. Secondly the code was like this:

Dim theMailMessage as new System.Web.Mail.MailMessage()

theMailMessage.Body = "hi"

Dim theSMTP as System.Web.Mail.SmtpMail()

theSMTP.Server = "IP.Address.Of.Server"

theSMTP.Send(theMailMessage)

of course its similar/same as yours. I wouldnt understand what could not cause it to get there. Its sending ok as you are saying but not recieving... bit of a puzzler. Again, I would disable your AV Software and send it, and check the junk email inbox too