Mail Client, to test javamail-1.4.5 API.

TesteMail.java

package mail.client;

import java.util.Enumeration;
import java.util.Properties;

import javax.mail.Address;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Store;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;

public class TesteMail {

  public static void main(String[] args) {
		Properties props = System.getProperties();
		String email = JOptionPane.showInputDialog("Email:");
		String psswd = getPassword();
		props.setProperty("mail.store.protocol", "imaps");
		try {
			Session session = Session.getDefaultInstance(props, null);
			Store store = session.getStore("imaps");
			store.connect("imap.gmail.com", email, psswd);

			Folder folder = store.getDefaultFolder();
			Message[] messages = folder.getMessages();
			System.out.println("Messages: " + messages.length);
			for (Message msg : messages) {
				System.out.println("====================================");
				Address[] from = msg.getFrom();
				for (Address address : from) {
					System.out.println("from: " + address.toString());
				}
				System.out.println("subject: " + msg.getSubject());
				@SuppressWarnings("rawtypes")
				Enumeration allHeaders = msg.getAllHeaders();
				while (allHeaders.hasMoreElements()) {
					System.out.println("headers: " + allHeaders.nextElement());
				}
			}

		} catch (javax.mail.NoSuchProviderException e) {
			e.printStackTrace();
		} catch (javax.mail.MessagingException e) {
			e.printStackTrace();
		}
	}

	private static String getPassword() {
		JPanel panel = new JPanel();
		JLabel label = new JLabel("Senha:");
		JPasswordField pass = new JPasswordField(20);
		panel.add(label);
		panel.add(pass);

		String[] options = new String[] { "OK", "Cancel" };
		int option = JOptionPane.showOptionDialog(null, panel, "Senha", JOptionPane.NO_OPTION, JOptionPane.PLAIN_MESSAGE, null, options, options[0]);
		if (option == 0) // pressing OK button
		{
			return new String(pass.getPassword());
		}
		return "";
	}
}