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Sending Email - Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

Posted on 2010-08-18
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Last Modified: 2013-11-30
I recently upgraded my computer at work and since then I cannot send email from applications running on my local computer.  This worked before the upgrade.  There is obviously some setting that needs to be tweaked but I don't know what it is.  Below is a very simple example of something that fails.  When it gets to the "theClient.Send(theEmailToSend)" it gets an exception and the message is: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

When i run this same code on a server as part of a Web application (with "theClient.Host" set to a proper IP address) it works fine.  I've always been able to change the host to "localhost" for my testing, but now it does not work.

Any ideas?

Thanks in advance.



System.Net.Mail.MailMessage theEmailToSend = new System.Net.Mail.MailMessage();
            System.Net.Mail.MailAddress theRecipient = new System.Net.Mail.MailAddress("TimAttaway@mchapusa.com", "Tim Attaway");
            theEmailToSend.To.Add(theRecipient);
            System.Net.Mail.MailAddress FromAddress = new System.Net.Mail.MailAddress("TimAttaway@mchapusa.com", "Tim Attaway");
            theEmailToSend.From = FromAddress;
            theEmailToSend.Body = "This is a simple email.";
            theEmailToSend.IsBodyHtml = false;
            theEmailToSend.Subject = "Email Test";
            System.Net.Mail.SmtpClient theClient = new System.Net.Mail.SmtpClient();
            theClient.Host = "localhost";
            theClient.Port = 25;
            theClient.Send(theEmailToSend);

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Question by:TimAttaway
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Accepted Solution

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nycynik earned 500 total points
ID: 33466400
This could be because the server is not accepting your request.  

- Might be a firewall issue on your local computer, or between you and the server.  
- It might be that the server is not accepting mail from your computer, this is common to prevent spam sending you have to authenticate with the server.
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Author Comment

by:TimAttaway
ID: 33466755
Actually the first problem was that SMTP service had never been installed on my local system.  I went to Control Panel -> Add/Remove Programs -> Add/Remove Windows Components -> IIS -> Details and clicked on SMTP Service to get that installed.  The next step was to get th email server to accept mail from my computer.  Thanks.
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Author Closing Comment

by:TimAttaway
ID: 33466772
Provided me a direction but did not supply the whole solution.
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