C#通过POP3协议验证 Email 账号

	 

	 

	static bool ValidateEmailAccount(string server, int port, string userName, string password, out string ErrorMessage) 

	        { 

	            ErrorMessage = ""; 

	 

	            //create a tcp connection 

	            TcpClient _server = new TcpClient(server, port); 

	             

	            //prepare  

	            NetworkStream netStream = _server.GetStream(); 

	            StreamReader reader = new StreamReader(_server.GetStream()); 

	 

	            if (!reader.ReadLine().Contains("+OK")) 

	            { 

	                //失败 

	                ErrorMessage = "server链接失败"; 

	                return false; 

	            } 

	 

	            string data; 

	            byte[] charData; 

	            string CRLF = "\r\n"; 

	 

	            //login 

	            data = "USER " + userName + CRLF; 

	            charData = System.Text.Encoding.ASCII.GetBytes(data); 

	            netStream.Write(charData, 0, charData.Length); 

	            if (!reader.ReadLine().Contains("+OK")) 

	            { 

	                //账户错误 

	                ErrorMessage = "账户错误"; 

	                return false; 

	            } 

	            data = "PASS " + password + CRLF; 

	            charData = System.Text.Encoding.ASCII.GetBytes(data); 

	            netStream.Write(charData, 0, charData.Length); 

	            if (!reader.ReadLine().Contains("+OK")) 

	            { 

	                //密码错误 

	                ErrorMessage = "密码错误"; 

	                return false; 

	            } 

	            return true; 

	        } 

	 

	 调用

	 

	 

	string errorMessage; 

	bool isContains = ValidateEmailAccount("pop3.163.com", 110, "wise_sandy@XXX.com", "************", out errorMessage); 

	 

	Console.WriteLine(isContains ? "用户存在" : errorMessage); 

	 

	  摘自 sandy的专栏

补充：软件开发 , C# ,

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