problem on sending email from my domain

Question

Hi friends,

               The following is my code for sending email  from my contact us page of my website. 

  

try

{

MailMessage Msg = new MailMessage();

// Sender e-mail address.

Msg.From = new MailAddress(txtEmail.Text);

// Recipient e-mail address.

Msg.To.Add("[email protected]");

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("[email protected]", "SolaiMail");

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 = "";

}

catch (Exception ex)

{

Console.WriteLine("{0} Exception caught.", ex);

}

 

and the smtp exception is 

Failure sending mail.