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_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$";
　　Regex re = new Regex( strRegex );
　　if ( re.IsMatch( inputEmail ) )
　　return ( true );
　　else
　　return ( false );
}

验证邮件地址的正确性：

string[] host = ( address.Split( @ ) );
string hostname = host[1];
IPHostEntry IPhst = Dns.Resolve( hostname );
IPEndPoint endPt = new IPEndPoint( IPhst.AddressList[0], 25 );
Socket s= new Socket( endPt.AddressFamily, SocketType.Stream,ProtocolType.Tcp );
s.Connect( endPt );
//Attempting to connect
if( !Check_Response( s, SMTPResponse.CONNECT_SUCCESS ) )
{
　　s.Close( );
　　return false;
}
//HELO server
Senddata( s, string.Format( "HELO {0}\r\n", 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.
Senddata( s, string.Format( "MAIL From: {0}\r\n","testexample@deepak.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 );