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copied!<p>I tried to reproduce this in Visual Studio 2012, but even when I set the compiler to use <code>.NET 2.0</code> I still did not encounter this issue.</p> <p>It is possible that you are missing the reference for <code>System.dll</code> which includes the namespace <code>System.Net.Mail</code>. Just as an precaution as you didn't include any sample code I will include a simple implementation of a Mail client as an example.</p> <pre><code>using (SmtpClient client = new SmtpClient("smtp-server.MyDomain.com")) { client.UseDefaultCredentials = true; using (MailMessage mail = new MailMessage()) { mail.Subject = subject; mail.Body = body; mail.From = new MailAddress("MyEmail@MyDomain.com"); mail.To.Add("ToThisEmail@MyDomain.com"); client.Send(mail); } } </code></pre> <p>Even though I wasn't able to reproduce this I would still recommend that you verify that you are compiling your project against the same target framework as your previous client.</p> <p>You can do this by right-clicking on your project and selecting <code>Target framework</code> under the <code>Application</code> tab.</p> <p><strong>Edit:</strong> It might be worth taking a screenshot of your current references and uploading it here at stackoverflow. It would give us an better overview of potential issues or conflicts.</p> <p><img src="https://i.stack.imgur.com/bePc5.png" alt="enter image description here"></p> <p>There should be no need to modify your <code>App.config</code>, but as a reference here you have mine.</p> <pre><code><?xml version="1.0"?> <configuration> <startup> <supportedRuntime version="v2.0.50727"/></startup> </configuration> </code></pre> <p><strong>Edit2:</strong></p> <p><strong>Add the <code>System.dll</code> reference.</strong></p> <ol> <li>Right click on your project and choose <code>Add Reference</code>. </li> <li>Find and add <code>System</code> (or <code>System.dll</code>) under <code>Assemblies</code> and <code>Framework</code>. </li> <li>Click <code>OK</code> to save.</li> </ol>

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