/*
 * The Mail.java program intends to communicate with SMTP port.
 * Here is how it works.
 * Precondition: The SMTP always listens on port 25. 
 * Step 1: connect to port 25 using TCP
 * Step 2: receive a line from mail server and print it out
 *         The line would read similar to the following
 *
 * 220 mesquite. Sendmail SMI-8.6/SMI-SVR4 ready at Mon, 23 Jun 1997
 * 11:00:14 -0500
 *
 * Step 3: send in the following lines:
 *    HELO (sending host)
 *    or EHLO (sending host) when an extended SMTP server is running
 *    MAIL FROM: (sender)
 *    RCPT TO: (recipient)
 *    DATA
 *    (mail message)
 *    (any number of lines)
 *    .
 *    QUIT
 */
import java.io.*;
import java.net.*;

class MailClient {
    public static void main(String[] args) throws IOException {
        if (args.length != 1) {
            System.out.println(" usage java MailClient host");
            System.exit(1);
        }
        Socket t = new Socket(args[0], 25);
	String str;

	DataInputStream is = new DataInputStream(t.getInputStream());
	PrintStream out = new PrintStream(t.getOutputStream());
	DataInputStream in = new DataInputStream(System.in);

        boolean more = true;
        str = is.readLine();
        System.out.println(str);
	while (more) {
	    str = in.readLine();
            out.println(str);
            if (str.trim().equals("DATA"))
		more = false;
            str = is.readLine();
            System.out.println(str);
	}  // while
        // begin to send message body
        String localStr = "";
        str = "";
        do {
           localStr = in.readLine();
           str += localStr + "\n";
        } while (!localStr.trim().equals("."));
        out.println(str);
	localStr = localStr.trim();
	localStr += "\r\n";
        out.println(localStr);
        str = is.readLine();
        System.out.println(str);
	// end of message body
	// now send a null string to end the process
	str = in.readLine();
        str += "\r\n";
        out.println(str);
    }  // main
}