Java发送匿名邮件—DNS解析

 直连其它邮件服务器的方式，需要使用DNS解析邮件服务器的域名
/**
     * DNS解析域名
     * @return String 返回解析后的邮件服务器地址
     * @throws Exception 异常
     */
    public MialList parseInetAddress(String domain) throws Exception
    {
        MialList mailList = new MialList();
        String dns = "dns:";
        String smtpHost = "";
        Hashtable env = new Hashtable();
        env.put(Context.INITIAL_CONTEXT_FACTORY,
                "com.sun.jndi.dns.DnsContextFactory");
        env.put(Context.PROVIDER_URL, dns);
        DirContext dir = new InitialDirContext(env);
       
        Attributes atts = dir.getAttributes(domain, new String[] {"MX"});
        if (null == atts || atts.size() <= 0)
        {
            RunLogger.debug("error:",
                    "Your dns server does not have a corresponding MX record!");
            throw new java.lang.IllegalStateException();
        }
        NamingEnumeration servers = atts.getAll();
        while (servers.hasMore())
        {
            Attribute att = (Attribute)servers.next();
            for (int i = 0; i < att.size(); i++)
            {
                smtpHost = (String)att.get(i);
               
                smtpHost = smtpHost.substring(smtpHost.indexOf(" ") + 1);
               
                RunLogger.debug("smtpHost:", smtpHost);
                mailList.add(smtpHost);
            }
        }
        return mailList;
    }
 
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