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copied!<p>You can start by looking at <a href="http://www.codeproject.com/KB/IP/despop3client.aspx" rel="nofollow noreferrer">http://www.codeproject.com/KB/IP/despop3client.aspx</a>. If you need SSL (for Gmail for example) - then here is an example for you. I wrote it a while ago, and it's based on some code I found on the Internet. (Sorry can't remember where - so no attribution)</p> <pre><code>public class Pop3EMail { public long Number { get; set; } public long Bytes { get; set; } public bool Retrieved { get; set; } public string Body { get; set; } } public class SecurePop3Client : TcpClient, IDisposable { SslStream netStream; static ILog log = LogManager.GetLogger(typeof(SecurePop3Client)); private SecurePop3Client() { } private void EstablishConnection(string serverAddress, int port, string sertificateName, string username, string password) { try { Connect(serverAddress, port); netStream = new SslStream(GetStream()); netStream.AuthenticateAsClient(sertificateName); CheckResponse(GetServerResponse()); CheckResponse(SendToServer(string.Format("USER {0}\r\n", username))); CheckResponse(SendToServer(string.Format("PASS {0}\r\n", password))); log.DebugFormat("Connected to {0}:{1}, with serificate :{2}", serverAddress, port, sertificateName); } catch (Exception e) { throw new SecurePop3Exception("Connecting to Email server failed", e); } } public void Disconnect() { CheckResponse(SendToServer("QUIT\r\n")); log.Debug("Disconnected from server"); } public List<Pop3EMail> List() { string response; var ret = new List<Pop3EMail>(); CheckResponse(SendToServer("LIST\r\n")); while (true) { response = GetServerResponse(); if (response == ".\r\n") { log.DebugFormat("Retrieved {0} messages from the server", ret.Count); return ret; } else { try { string[] values = response.Split(new char[] { ' ' }); Pop3EMail mail = new Pop3EMail { Number = Int32.Parse(values[0]), Bytes = Int32.Parse(values[1]), Retrieved = false }; ret.Add(mail); } // catch (ArgumentNullException) // catch (FormatException) // catch (OverflowException) // catch (IndexOutOfRangeException) catch (Exception e) { throw new SecurePop3Exception("Parsing message list failed", e); } } } } public void RetrieveBody(Pop3EMail mail) { string response; CheckResponse(SendToServer(string.Format("RETR {0}\r\n", mail.Number))); StringBuilder body = new StringBuilder(); while (true) { response = GetServerResponse(); if (response == ".\r\n") { break; } else { body.Append(response); } } mail.Retrieved = true; mail.Body = body.ToString(); log.DebugFormat("Retrieved body of mail {0}", mail.Number); } public void Delete(Pop3EMail mail) { CheckResponse(SendToServer(string.Format("DELE {0}\r\n", mail.Number))); log.DebugFormat("Deleted Email {0}", mail.Number); } private string GetServerResponse() { byte[] buffer = new Byte[1024]; int count = 0; while (true) { byte[] buff = new Byte[2]; int bytes = netStream.Read(buff, 0, 1); if (bytes == 1) { buffer[count] = buff[0]; count++; if (buff[0] == '\n') { break; } } else { break; }; }; string retval = Encoding.ASCII.GetString(buffer, 0, count); log.DebugFormat("GOT FROM SERVER: {0}",retval); return retval; } private string SendToServer(string message) { try { byte[] buffer = new byte[1024]; buffer = Encoding.ASCII.GetBytes(message); netStream.Write(buffer, 0, buffer.Length); log.DebugFormat("SEND TO SERVER: {0}", message); return GetServerResponse(); } catch (Exception e) { throw new SecurePop3Exception(string.Format("Communication with server failed"), e); } } private void CheckResponse(string response) { if (string.IsNullOrEmpty(response) || response.Length < 3 || string.Compare(response.Substring(0, 3),"+OK",true) != 0) { throw new SecurePop3Exception(response); } } /// <summary> /// Factory /// </summary> /// <param name="serverAddress"></param> /// <param name="port"></param> /// <param name="sertificateName"></param> /// <returns></returns> public static SecurePop3Client Connect(string serverAddress, int port, string sertificateName, string username, string password) { SecurePop3Client client = new SecurePop3Client(); client.EstablishConnection(serverAddress, port, sertificateName, username, password); return client; } #region Dispose Design Pattern Implementation /// <summary> /// Dispose /// </summary> public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } /// <summary> /// Disposes the instance. /// </summary> /// <param name="disposing">if set to <c>true</c> [disposing].</param> protected override void Dispose(bool disposing) { if (disposing) { Disconnect(); netStream.Dispose(); } base.Dispose(disposing); } // Use C# destructor syntax for finalization code. ~SecurePop3Client() { // Simply call Dispose(false). Dispose(false); } #endregion } </code></pre>

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