How To Know If Email Failed To Reach Its Receivers
Jan 24, 2010
I am sending email using the following utility class, if receiver foo@[URL] is not exist or the email never reach him for one reason or another, I want my application to be notified. It works only when the smtp client failed to connect to the smtp server, I got an exception in this case, otherwise, the only way to know if email fail to reach the client is by checking client account.
public static class EmailUtil
{
/// <summary>
/// Fires exception if string is null or empty
/// </summary>
/// <param name="param">param value</param>
/// <param name="paramName">is the parameter name to be shown in the exception message</param>
private static void CheckStringParam(string parameter, string paramName)
{
if (String.IsNullOrEmpty(parameter))
{
throw new ArgumentException(String.Format("{0} can't be null or empty", paramName));
}
}
public static void SendEmail(EmailArgument emailArg)
{
CheckStringParam(emailArg.FromEmail, "emailArg.FromEmail");
CheckStringParam(emailArg.Subject, "emailArg.Subject");
CheckStringParam(emailArg.Body, "emailArg.Body");
string body = emailArg.Body;
MailMessage mailMsg = new MailMessage();
mailMsg.From = new MailAddress(emailArg.FromEmail);
foreach(string recipient in emailArg.ToEmails)
{
if (String.IsNullOrEmpty(recipient))
{
throw new ArgumentException("One of the values in the emailArg.ToEmails array is null or empty");
}
mailMsg.To.Add(new MailAddress(recipient));
}
mailMsg.IsBodyHtml = emailArg.IsHtml;
if (emailArg.PutHtmlTags)
{
body = String.Format("{0}" + body + "{1}", "<HTML><Body>", "</Body></HTML>");
}
mailMsg.Body = body;
mailMsg.BodyEncoding = emailArg.BodyEncoding;
// Get client info from the config file , it is tested with Web.config, need to be tested with App.config
SMTPConfiguration smtpConfig = (SMTPConfiguration)System.Configuration.ConfigurationManager.GetSection("SMTPConfigurationGroup/SMTPServer");
SmtpClient client = new SmtpClient(smtpConfig.Host, smtpConfig.Port);
client.EnableSsl = smtpConfig.EnableSSL;
client.Credentials = new System.Net.NetworkCredential(smtpConfig.Username, smtpConfig.Password);
// The notifications of failure are sent only to the client email.
// Exceptions are not guranteed to fire if the Receiver is invalid; for example gmail smtp server will fire exception only when receiver@gmail.com is not there.
// Exceptions will be fired if the server itself timeout or does not responding (due to connection or port problem, extra).
mailMsg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
client.Send(mailMsg);
}
}
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