SMTP Client - 'The SMTP host was not specified"

I am trying to send an email using the SMTPClient class but I keep getting the 'SMTP host was not specified error'. This is the code:
                    Dim smtpServer As SmtpClient
                    smtpServer = New SmtpClient()
                    smtpServer.Send(emailMessage)
                    smtpServer = Nothing
where emailMessage is an object of type MailMessage and is populated earlier in the function.
 
When I instantiate the object like this:
     smtpServer = New SmtpClient("our.host")
it works correctly.

As I understand it, the SMTPClient should obtain the host from the config file:
<configuration>
  <system.net>
    <mailSettings>
      <smtp deliveryMethod="network">
        <network host="our.host"/>
      </smtp>
    </mailSettings>
  </system.net>
</configuration>

The config file also contains system.diagnostic and runtime settings which I've left out for clarity.

Incidentally the framework is 2.0.

Any help would be much appreciated


spiraljonnyAsked:
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spiraljonnyConnect With a Mentor Author Commented:
I tried the workaround, but putting the host into the appSettings section didn't work. I deleted the config file and created a new config file without the system.diagnostics and now it works correctly.
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apeterCommented:
See Below link. Other better way I think is by adding the server name and other details in AppSettign section of the config file and reading them using configurationmanager.

http://forums.msdn.microsoft.com/en-US/csharpgeneral/thread/4ab25de2-4278-4d62-b2c1-c4dfc8975605/
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