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I tried sending 300 mails at a once to same email id from my program. I am getting the below SMTP Exception

Use the ManualResetEvent object. I'm guessing the SmtpClient is being disposed that's why it's losing the subscription to MailClient_SendCompleted

ManualResetEvent resetEvent;
private void DispatchMail(MailMessage message,
MessageTrackerObject trackInfo)
    // other code here
    resetEvent = new ManualResetEvent(false);
    mailClient.EnableSsl =
== "true";
    mailClient.SendCompleted += new
    mailClient.SendAsync(message, trackInfo);
// waits for 5 seconds

private void MailClient_SendCompleted(object
sender, AsyncCompletedEventArgs e)
    resetEvent.Set(); // removes the wait after
successfully sending
    string error = "";
    MessageTrackerObject data =
    // other code here

Categories : C#

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