C # verify the Email account through POP3 protocol

 

 

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 "))

{

// Failed

ErrorMessage = "server link failed ";

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 "))

{

// Account Error

ErrorMessage = "Account Error ";

Return false;

}

Data = "PASS" + password + CRLF;

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

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

If (! Reader. ReadLine (). Contains ("+ OK "))

{

// Incorrect password

ErrorMessage = "Incorrect password ";

Return false;

}

Return true;

}

 

Call

 

 

String errorMessage;

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

 

Console. WriteLine (isContains? "User exists": errorMessage );

 

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