Get something about it, if send email failure

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ASP.NET

Hi everyone,
I get a problem about sending email,
I will get a feedback from myemail address,If send email failure
Here is the code:

protected void SendEmail(string strFrom, string strTo, string strCc, string strSubject, string strMessage, string lang)
{
    try
    {
        System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
        strFrom = strFrom.Trim();
        strTo = strTo.Trim();
        strCc = strCc.Trim();
        if (lang == "Japanese")
        {
            msg.BodyEncoding = System.Text.Encoding.UTF8;
            msg.SubjectEncoding = System.Text.Encoding.UTF8;
        }
        else
        {
            msg.BodyEncoding = System.Text.Encoding.UTF8;
            msg.SubjectEncoding = System.Text.Encoding.UTF8;
        }
        msg.From = new System.Net.Mail.MailAddress(strFrom);
        msg.To.Add(strTo);
        if (strCc != "")
        {
            string[] cctoS = strCc.Split('^');
            for (int i = 0; i < cctoS.Length; i++)
            {
                msg.CC.Add(cctoS[i]);
            }
        }
        msg.Subject = strSubject;
        msg.IsBodyHtml = true;
        msg.Body = strMessage;
        msg.Headers.Add("X-Mailer", "Microsoft Outlook Express 6.00.2900.2869");
        msg.Headers.Add("X-MimeOLE", "Produced By Microsoft MimeOLE V6.00.2900.2869");

        System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient();

        //For get message,if send email fail.
        msg.DeliveryNotificationOptions = System.Net.Mail.DeliveryNotificationOptions. .OnFailure;

        msg.ReplyTo = new System.Net.Mail.MailAddress("myemailaddress");

        smtp.Host = "smtp-au.server-mail.com";
        smtp.Send(msg); //send email out

    }
    catch (Exception err)
    {

    }


}