Hi everyone,
I get a really odd error while using SMTPClient.Send() function in ASP.Net.
The error is the following:

Dim smtp As New Net.Mail.SmtpClient("smtp.thetotalsite.it", 25)
                   Dim bodyMSG As String
                   bodyMSG = "something"
                   smtp.Send("something@thetotalsite.it",
someone@gmail.com, "Message from thetotalsite", bodyMSG)

Well, on my local machine (using the integrated web server of Visual
Studio), it works...
Incredibly, on the remote web server, it does not work!
It seems as if the web server filtered emails coming from localhost/ASP.Net
runtime o.O
The runtime give me this error:

System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The
server response was: Relay denied
  at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender,
MailAddressCollection recipients, String deliveryNotify,
SmtpFailedRecipientException& exception)
  at System.Net.Mail.SmtpClient.Send(MailMessage message)
  at System.Net.Mail.SmtpClient.Send(String from, String recipients, String
subject, String body)
  at controls_comments.Submit_Click(Object sender, EventArgs e)

So, "Relay denied"... But I'm using an existing email account!
(something@thetotalsite.it) and, in fact, it works perfectly on Outlook
Express or Visual Studio.
Why this strange behavior? Is it a bug? How can I solve it?

Thanks in advance,

P.s.: I'm using .Net Framework 2.0.