我正在使用SmtpClient.Send 方法发送电子邮件,但是当我尝试发送到一个不存在的电子邮件帐户时,Send 方法没有抛出异常,我如何判断收件人邮件地址是否有效,或者邮件不会到达,或检测此问题。
代码:
Properties.Settings appSettings = new Properties.Settings();
MailMessage message = new MailMessage();
message.From = new MailAddress(appSettings.senderMail);
message.Subject = appSettings.mailsubj;
message.Body = appSettings.mailbody;
Attachment attach = new Attachment(sOutput);
message.Attachments.Add(attach);
SmtpClient client = new SmtpClient(appSettings.SMTP);
client.SendCompleted += this.SendCompletedCallback;
foreach (String clientEmail in clientEmailList)
{
message.To.Clear();
message.To.Add(clientEmail);
//client.Send(message);
try
{
client.Send(message);
AddToLog(String.Format("\t{0}{1}", Properties.Resources.ResourceManager.GetString("MAIL_SEND_SUCCESS"), clientEmail));
}
catch (SmtpFailedRecipientException ex)
{
AddToLog(String.Format("\t{0}{1}:\n\t{2}", Properties.Resources.ResourceManager.GetString("MAIL_SEND_ERROR"), clientEmail, ex.Message));
}
catch (SmtpException smtp_Ex)
{
AddToLog(String.Format("\t{0}{1}:\t{2}", Properties.Resources.ResourceManager.GetString("MAIL_SEND_ERROR"), clientEmail, "Cannot connect to SMTP server."));
}
catch (Exception ex)
{
AddToLog(String.Format("\t{0}{1}:\n\t{2}", Properties.Resources.ResourceManager.GetString("MAIL_SEND_ERROR"), clientEmail, ex.Message));
}
// client.SendAsync(message, clientEmail);
}