I want to write a program to send email, using smtp protcol,and each time the co

Question

I want to write a program to send email, using smtp protcol,and each time the compiler give me error on this line sendCommand("HELP".concat(localhost),250); and the program give me something like it's not even exist inthe library, I am using NetBeans Please I need Help I want to write a program to send email, using smtp protcol,and each time the compiler give me error on this line sendCommand("HELP".concat(localhost),250); and the program give me something like it's not even exist inthe library, I am using NetBeans Please I need Help

Explanation / Answer

x.Xom.sun.xml.internal.messaging.saaj.soap.Envelope;     import java.net.*;     import java.io.*;     import java.util.*;     /**     * Open an SMTP connection to a remote machine and send one mail.     */     public class SMTPConnection {     /* The socket to the server */     private Socket connection;     /* Streams for reading and writing the socket */     private BufferedReader fromServer;     private DataOutputStream toServer;     private static final int SMTP_PORT = 25;     private static final String CRLF = " ";     /* Are we connected? Used in close() to determine what to do. */     private boolean isConnected = false;     /* Create an SMTPConnection object. Create the socket and the     associated streams. Initialize SMTP connection. */     public SMTPConnection(Envelope envelope) throws IOException {     connection = new Socket("smtp.".concat(envelope.DestHost), SMTP_PORT);     fromServer = new BufferedReader(new InputStreamReader(connection.getInputStream()));     toServer = new DataOutputStream(connection.getOutputStream());     /* Read a line from server and check that the reply code is 220.     If not, throw an IOException. */     String text = fromServer.readLine();     System.out.println(parseReply(text));     if (parseReply(text) != 220)     throw new IOException();     System.out.println("Mail server ".concat("smtp.").concat(envelope.DestHost).concat(" found."));     /* SMTP handshake. We need the name of the local machine.     Send the appropriate SMTP handshake command. */     String localhost = (InetAddress.getLocalHost()).getCanonicalHostName();     System.out.println("LOCALHOST: "+localhost);     sendCommand("HELO ".concat(localhost), 250);     isConnected = true;     }     /* Send the message. Write the correct SMTP-commands in the     correct order. No checking for errors, just throw them to the     caller. */     public void send(Envelope envelope) throws IOException {     /* Send all the necessary commands to send a message. Call     sendCommand() to do the dirty work. Do _not_ catch the     exception thrown from sendCommand(). */     sendCommand("MAIL FROM: ".concat(envelope.Sender),250);     sendCommand("RCPT TO: ".concat(envelope.Recipient),250);     sendCommand("DATA",354);     sendCommand(envelope.Message.toString().concat(CRLF).concat("."),250);     }     /* Close the connection. First, terminate on SMTP level, then     close the socket. */     public void close() {     isConnected = false;     try {     sendCommand("QUIT", 221); // closes SMTP     connection.close(); // closes socket     } catch (IOException e) {     System.out.println("Unable to close connection: " + e);     isConnected = true;     }     }     /* Send an SMTP command to the server. Check that the reply code     is what is is supposed to be according to RFC 821. */     private void sendCommand(String command, int rc) throws IOException{     /* Write command to server and read reply from server. */     System.out.println("Command to server: " + command);     command = command.concat(CRLF); // adds newline at end of command.     toServer.writeBytes(command);     /* Check that the server’s reply code is the same as the     parameter rc. If not, throw an IOException. */     String text = fromServer.readLine();     System.out.println("Reply from server: " + text);     if (parseReply(text) != rc){     System.out.println("reply codes do not match");     throw new IOException();     }     }

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