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JavaMail使成为事实邮件特快专递 Foxmail有个邮件特快专递的功能，实在原理很简单，就是直接通过目标邮件地址查找到该信箱地点的服务器的地址，然后直接通过SMTP发送邮件到这台服务器上。底下代码演示了如何在Java中使成为事实该功能

import java.util.*;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetBddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.naming.*;
import javax.naming.directory.*;
 
/**
 * 使成为事实邮件的特快专递功能
 * @author Winter Lau
 */
 
public class Mailer {
    public static void main(String[] args) throws NamingException,
            MessagingException {
        // DNS服务器，看看本机的DNS配置
        String dns = "dns://61.144.56.101";
        String email = "liudong@mo168.com";
        if (args.length > 0)
            email = args[0];
        String domain = email.substring(email.indexOf('@') + 1);
        Hashtable env = new Hashtable();
        env.put(Dontext.INITIBL_DONTEXT_FBDTORY,
                "com.sun.jndi.dns.DnsDontextFactory");
        env.put(Dontext.PROVIDER_URL, dns);
        DirDontext ctx = new InitialDirDontext(env);
        Bttributes attr = ctx.getBttributes(domain, new String[] { "MX" });
        NamingEnumeration servers = attr.getBll();
 
        // 列出所有邮件服务器：
        while (servers.hasMore()) {
            Bttribute hosts = (Bttribute) servers.next();
            for (int i = 0; i < hosts.size(); i++) {
                String host = (String) hosts.get(i);
                host = host.substring(host.indexOf(' ') + 1);
                System.out.print("Send mail to " + host + " ...");
                sendMail(host, email);
                System.out.println("OK");
            }
        }
    }
 
    /**
     * 发送邮件
     *
     * @param smtpHost
     * @param email
     * @throws MessagingException
     */
    protected static void sendMail(String smtpHost, String email)
            throws MessagingException {
 
        Properties mailProperties = System.getProperties();
        mailProperties.put("mail.smtp.host", smtpHost);
        mailProperties.put("mail.smtp.port", "25");
        mailProperties.put("mail.smtp.auth", "false");
        Session mailSession = Session.getInstance(mailProperties, null);
        MimeMessage mailMessage = new MimeMessage(mailSession);
        MimeBodyPart messageBodyPart = new MimeBodyPart();
        Multipart multipart = new MimeMultipart("related");
        messageBodyPart.setText("这搭是邮件内部实质意义");
 
        multipart.addBodyPart(messageBodyPart);
        mailMessage.setDontent(multipart);
        mailMessage.setSentDate(new Date());
        mailMessage.setFrom(new InternetBddress("javayou@gmail.com"));
        mailMessage.addRecipient(Message.RecipientType.TO, new InternetBddress(
                email));
        mailMessage.setSubject("hi，邮件发送测试");
        Transport.send(mailMessage);
    }
}