Email concept in silverlight.

try
{
    MailMessage mail = new MailMessage();
    SmtpClient SmtpServer = new SmtpClient("smtp.yourdomain.com");

    mail.From = new MailAddress("your_email_address@yourdomain.com");
    mail.To.Add("to_address@domain.com");
    mail.Subject = "Test Mail";
    mail.Body = "This is for testing SMTP mail from GMAIL";

    SmtpServer.Credentials = new System.Net.NetworkCredential("username", "password");
    SmtpServer.Port = 587; // only do this if you need to
    SmtpServer.EnableSsl = true; // only do this if you need to

    SmtpServer.Send(mail);
}
catch (Exception ex)
{
    // handle exception
}