sending email is not working.

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ASP.NET4

Hi friends,

the following is my code for sending email using my server.but it throws an exception.

try
        {
            MailMessage Msg = new MailMessage();
            // Sender e-mail address.
            Msg.From = new MailAddress(txtEmail.Text);
            // Recipient e-mail address.
            Msg.To.Add("info@dhuvara.com");
            Msg.Subject = txtSubject.Text;
            Msg.Body = txtMessage.Text;
            Msg.IsBodyHtml = true;
            // your remote SMTP server IP.
            SmtpClient smtp = new SmtpClient();
            smtp.Host = "mail.dhuvara.com"; 
            smtp.Port = 25;
            Msg.Priority = MailPriority.Normal;
            smtp.Credentials = new System.Net.NetworkCredential("xxxxxx", "xxxxx");
            smtp.EnableSsl = true;
            smtp.Send(Msg);
            //Msg = null;
            lbltxt.Text = "Thanks for Contact us";
            // Clear the textbox valuess
            txtName.Text = "";
            txtSubject.Text = "";
            txtMessage.Text = "";
            txtEmail.Text = "";

and the smtp exception is : "failure to send mail"