Question

using (MailMessage message = new MailMessage())
                {
                    message.From = new MailAddress(userEmail.InnerText);
                    message.To.Add(new MailAddress("[e-mail]"));
                                      message.Subject = selection.Text;
                    message.Body = htmlBody();
                    message.IsBodyHtml = true;
                    SmtpClient client = new SmtpClient("142.16.0.142"); 
                    client.Send(message);

                }

How do I verify client.send(message) succeded?

Answer 1

Put Send() method inside try..catch block and catch SmtpFailedRecipientsException:

try
{
   client.Send(message);
}
catch(SmtpFailedRecipientsException smtpFex)
{
    string failedRecipient = smtpFex.FailedRecipient;
    // it will return FailedRecipient's emailID. Now check the value of failedRecipient 
    //and take the action/s.
}