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MailMessage mail = new MailMessage();
string Subject = "User Inquery";
mail.To.Add("[email protected]");
mail.From = new MailAddress("[email protected]", "Sundas");
mail.Subject = Subject.Trim();
mail.Body += "Dear Administrator,<br><br>.";
mail.Body += "User Emial: " + Email.Text + "<br>";
mail.Body += "User Message: " + txtBody.Text + "<br><br>";
mail.Body += "Thanks & Regards<br>";
mail.Body += txtName.Text;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.mail.yahoo.com";
smtp.Port = 465;
smtp.Credentials = new System.Net.NetworkCredential("[email protected]", "*****");
smtp.EnableSsl = true;
smtp.Send(mail);
Mögliches Duplikat von ["Die Zeitüberschreitung bei der Verwendung von SmtpClient"] (http://stackoverflow.com/questions/13165396/the-operations-timed-out-when-using-smtpclient) –