String localhost = (InetAddress.getLocalHost()).getHostName();
	try {
	    sendCommand("HELO " + localhost, 250);
	} catch (IOException e) {
	    System.out.println("HELO failed. Aborting.");
	    return;
	}
	isConnected = true;
    }

    /* Send the message. Simply writes 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 {
	sendCommand("MAIL FROM:<" + envelope.Sender + ">", 250);
	sendCommand("RCPT TO:<" + envelope.Recipient + ">", 250);
	sendCommand("DATA", 354);
	sendCommand(envelope.Message.toString() + CRLF + ".", 250);
    }