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POCannot use smtpclient to send mail with localhost iis site
 

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    <p>I have an asp.net mvc app running on a local iis website that is failing to send mail using SmtpClient from System.Net.Mail. I am trying to send a mail to my hotmail address and I get a socket exception. Any idea what the problem might be?</p> <pre><code>using(var message = new MailMessage()) { message.From = new MailAddress(AdminEmail); message.To.Add(new MailAddress(to)); message.Subject = subject; message.Body = body; message.IsBodyHtml = false; var mailClient = new SmtpClient(); mailClient.Send(message); } </code></pre> <p>Here is the exception:</p> <pre><code>{System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:25 at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket&amp; socket, IPAddress&amp; address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception&amp; exception)} </code></pre> <p>I think the default app pool does not have access to intepub\wwwroot. Here is the error that I get when trying to test the connection:</p> <p>The server is configured to use pass-through authentication with a built-in account to access the specified physical path. However, IIS Manager cannot verify whether the built-in account has access. Make sure that the application pool identity has Read access to the physical path. If this server is joined to a domain, and the application pool identity is NetworkService or LocalSystem, verify that \$ has Read access to the physical path. Then test these settings again.</p>
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    1. CODo you have an smtp server running on your localhost?
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    2. COI think this is part of my problem. I opened IIS Manager and set the SMTP server as localhost but it still does not work. Is there anything else that needs to be configured?
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    3. COCan you telnet to port 25 on your local machine? What OS are you running? Do you have a firewall on the local machine?
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