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    <p>I think that if you are looking to test the SMTP it's that you are looking for a way to validate your configuration and network availability without actually sending an email. Any way that's what I needed since there were no dummy email that would of made sense.</p> <p>With the suggestion of my fellow developer I came up with this solution. A small helper class with the usage below. I used it at the OnStart event of a service that sends out emails.</p> <p>Note: the credit for the TCP socket stuff goes to Peter A. Bromberg at <a href="http://www.eggheadcafe.com/articles/20030316.asp" rel="nofollow noreferrer">http://www.eggheadcafe.com/articles/20030316.asp</a> and the config read stuff to the guys here: <a href="https://stackoverflow.com/questions/625262/c-access-programatically-system-net-settings-from-app-config">Access system.net settings from app.config programmatically in C#</a></p> <p><strong>Helper:</strong></p> <pre><code>public static class SmtpHelper { /// &lt;summary&gt; /// test the smtp connection by sending a HELO command /// &lt;/summary&gt; /// &lt;param name="config"&gt;&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public static bool TestConnection(Configuration config) { MailSettingsSectionGroup mailSettings = config.GetSectionGroup("system.net/mailSettings") as MailSettingsSectionGroup; if (mailSettings == null) { throw new ConfigurationErrorsException("The system.net/mailSettings configuration section group could not be read."); } return TestConnection(mailSettings.Smtp.Network.Host, mailSettings.Smtp.Network.Port); } /// &lt;summary&gt; /// test the smtp connection by sending a HELO command /// &lt;/summary&gt; /// &lt;param name="smtpServerAddress"&gt;&lt;/param&gt; /// &lt;param name="port"&gt;&lt;/param&gt; public static bool TestConnection(string smtpServerAddress, int port) { IPHostEntry hostEntry = Dns.GetHostEntry(smtpServerAddress); IPEndPoint endPoint = new IPEndPoint(hostEntry.AddressList[0], port); using (Socket tcpSocket = new Socket(endPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp)) { //try to connect and test the rsponse for code 220 = success tcpSocket.Connect(endPoint); if (!CheckResponse(tcpSocket, 220)) { return false; } // send HELO and test the response for code 250 = proper response SendData(tcpSocket, string.Format("HELO {0}\r\n", Dns.GetHostName())); if (!CheckResponse(tcpSocket, 250)) { return false; } // if we got here it's that we can connect to the smtp server return true; } } private static void SendData(Socket socket, string data) { byte[] dataArray = Encoding.ASCII.GetBytes(data); socket.Send(dataArray, 0, dataArray.Length, SocketFlags.None); } private static bool CheckResponse(Socket socket, int expectedCode) { while (socket.Available == 0) { System.Threading.Thread.Sleep(100); } byte[] responseArray = new byte[1024]; socket.Receive(responseArray, 0, socket.Available, SocketFlags.None); string responseData = Encoding.ASCII.GetString(responseArray); int responseCode = Convert.ToInt32(responseData.Substring(0, 3)); if (responseCode == expectedCode) { return true; } return false; } } </code></pre> <p><strong>Usage:</strong></p> <pre><code>if (!SmtpHelper.TestConnection(ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None))) { throw new ApplicationException("The smtp connection test failed"); } </code></pre>
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    1. COGreat solution. Works like a charm and allows me to easily switch between SMTP servers if the first one is not available for some reason.
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