Using System.Net.Mail

 
I'm going out of my mind trying to get System.Net.Mail to work in an
app, but am having no joy.  I was using System.Web.Mail, and the
following code works like a charm:

MailMessage mm = new MailMessage()
mm.To = "[email protected]";
mm.From = "[email protected]";
mm.Body = "Just testing this";
mm.Subject = "Testing 123";

SmtpMail.Send(mm);

VS2005 says it's obsolete, so I'm trying to use the "new and improved"
methods.  

I look at the sample code in MSDN on using the Send method in
System.Net.Mail.SmtpClient as found here:

http://msdn2.microsoft.com/en-us/library/swas0fwc.aspx

And the code that I am attempting to execute is:

string to = "[email protected]";
string from = "[email protected]";
MailMessage message = new MailMessage(from, to);
message.Subject = "Using the new SMTP client.";
message.Body = @"Using this new feature, you can send an e-mail message
from an application very easily.";
SmtpClient client = new SmtpClient(Server);
client.UseDefaultCredentials = true;
client.Send(message);

When the Send is executed this exception is raised:
"An established connection was aborted by the software in your host
machine "

Looking further, the status code given is "GeneralFailure", the
exception message is "Failure sending mail." and the inner exception
message is "Unable to connect to the remote server".

The problem may or may not be centered around the server name.  It's a
server on our intranet, and I have tried both its name and its IP
address, but no joy.  

Does anyone have any suggestions?

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