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Sending Email SMTP Client Asynchronously

Posted on 2015-01-14
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Last Modified: 2016-01-30
I need to send email asychronously without interrupting the calling thread, but the built in sendasync method does block the calling thread.  If I run the software I'm using with an internet connection, there is no problem, but if I disconnect the computer from the internet, the software will freeze for approximately 15 seconds before giving up the attempt to send the email.  Here is the code I'm using:


        public void Send_Error_Email(SmtpClient inputClient, MailMessage inputMessage)
        {
            inputClient.SendCompleted += new SendCompletedEventHandler(error_SendCompleted);

            if (inputMessage.To != null)
            {
                if (inputMessage.To.Count > 0)
                {
                    //fix error regarding 'Mailbox unavailable'
                    inputClient.SendAsync(inputMessage, "Email");
                }
            }

Is there something wrong with this code?  I thought it was supposed to run on its own thread based on the MSDN description, but it does not do so. Thanks for any help you can offer.
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Question by:l2Bravo
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Accepted Solution

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l2Bravo earned 0 total points
ID: 40591766
Nobody answered the question, but I found a solution by simply creating my own thread to send the email.  While the documentation seems to indicate the SendAsync method does this automatically, I assumed I did not have to.  But, because the documentation does not seem to be correct (or I'm reading it wrong), I created a simple thread to send the email and close after that action is completed, with a timeout of 10 seconds on the Send method.
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