private void SendMail(MailMessage msg)
    {
        try
        {
            var smtp = new SmtpClient();
            smtp.Send(msg);
        }
        catch (SmtpFailedRecipientException exFailed)
        {
            lblExSendMail.Text = exFailed.Message;
        }
    }

<system.net>
<mailSettings>
  <smtp deliveryMethod="Network" from="xyz@xyz.com">
    <network host="smtpout.secureserver.net" port="80" userName="xyz@xyz.com" password="xyz-password" />
  </smtp>
</mailSettings>

SmtpClient MySMTPClient;
MailMessage myEmail;
MySMTPClient = new SmtpClient("smtp.secureserver.net", 25);
MySMTPClient.Credentials = new NetworkCredential("<MailID>", "<Password>");
myEmail = new MailMessage(new MailAddress("<sender>"), new MailAddress("<receiver>"));
myEmail.Body = "Email from Windows Azure Application";
myEmail.Subject = "Email from Windows Azure";
try
{
  MySMTPClient.Send(myEmail);
}
catch (Exception ex)
{
  // Display Exception Details
}