邮件发送在Asp.net中的消息(如何检查邮件是否发送?)

protected void btnSend_Click(object sender, EventArgs e)
{
    string mFrom = "xxx.com";
    string mTo = "yyy.com";
   string msub="TESTSUBJECT";
    string mMsg="TEST msg";
    string mCc = "Test cc";
    // User credential used for sending mail
    string EmailSender = "xxx.com";
    string EmailSenderPasswd = "zzz";
    System.Net.NetworkCredential myCachet = new System.Net.NetworkCredential(EmailSender, EmailSenderPasswd);
    SmtpClient smtp = new SmtpClient("smtpout.secureserver.net", 12234);
    smtp.Credentials = myCachet;
    MailMessage message = new MailMessage(mFrom.ToString(), mTo.ToString());
    message.Subject = msub.ToString();
    message.Body = mMsg.ToString();
    message.IsBodyHtml = true;
    if (mCc.Trim() != String.Empty)
    {
        message.CC.Add(new MailAddress(mCc.ToString()));
    }
    smtp.Send(message);
    message.Dispose();
}

如果我传递了错误的密码，smtp.send(message)方法返回" message failure"。但是，如果我传递错误的电子邮件地址，它返回作为成功消息为"消息成功"，它不提供任何异常，即使我尝试尝试捕获异常。如何知道消息已成功传递?如果该消息没有成功交付意味着它应该抛出一个未交付的邮件，如gmail(邮件交付失败)。帮助我。