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1、C#验证邮件的正则表达式的代码验证输入的正确性public static bool isEmail(string inputEmail)inputEmail = NulltoString(inputEmail);string strRegex = (a-zA-Z0-9_-.+)(0-91,3.0-91,3.0-91,3.)|(a-zA-Z0-9-+.)+)(a-zA-Z2,4|0-91,3)(?)$;Regex re = new Regex(strRegex);if (re.IsMatch(inputEmail)return (true);elsereturn (false);验证邮件地址的正
2、确性：string host = (address.Split();string hostname = host1;IPHostEntry IPhst = Dns.Resolve(hostname);IPEndPoint endPt = new IPEndPoint(IPhst.AddressList0, 25);Socket s= new Socket(endPt.AddressFamily, SocketType.Stream,ProtocolType.Tcp);s.Connect(endPt);/Attempting to connectif(!Check_Response(s, SMT
3、PResponse.CONNECT_SUCCESS) s.Close();return false;/HELO serverSenddata(s, string.Format(HELO 0rn, Dns.GetHostName() );if(!Check_Response(s, SMTPResponse.GENERIC_SUCCESS)s.Close();return false;/Identify yourself/Servers may resolve your domain and check whether you are listed in BlackLists etc.Sendda
4、ta(s, string.Format(MAIL From: 0rn,testexampledeepak.portland.co.uk);if(!Check_Response(s, SMTPResponse.GENERIC_SUCCESS)s.Close();return false;/Attempt Delivery (I can use VRFY, but most SMTP servers only disable it for security reasons)Senddata(s, address);if(!Check_Response(s, SMTPResponse.GENERIC_SUCCESS)s.Close();return false;return (true);
