关于Javamail发送邮件，本机测试可以正常发送，放到服务器上就不行了

最近写了一个javamail通过smtp发送邮件的代码，在本机上测试一切OK，当我放到服务器上的时候，报AuthenticationFailedException异常，验证我也加上去了，找了半天也没找出原因，请大家帮忙看看，下面是我的代码

public class SendMailAgent {
  private MimeMessage mimeMsg;  //MIME邮件对象

  private Session session;      //邮件会话对象
  private Properties props;     //系统属性
  private boolean needAuth = true;  //smtp是否需要认证
  private String hostName = constantVar.EMAIL_SERVER;
  private String username = constantVar.EMAIL_ACCOUNT;  //smtp认证用户名和密码
  private String password = constantVar.EMAIL_PASSWORD;
  private String from = constantVar.EMAIL_MANAGER;

  private Multipart mp;    //Multipart对象,邮件内容,标题,附件等内容均添加到其中后再生成MimeMessage对象

/*  public SendMailAgent() {
    setSmtpHost(ConsConfig.mailHost);//如果没有指定邮件服务器,就从getConfig类中获取
    createMimeMessage();
  }**/

  public SendMailAgent(){
    //System.out.println(hostName);
    setSmtpHost();
    createMimeMessage();
  }


 /**
  * @param hostName String
  */
  public void setSmtpHost(  ) {
    //System.out.println("设置系统属性：mail.smtp.host = "+hostName);
    if(props == null)props = System.getProperties();         //获得系统属性对象
    props.put("mail.smtp.host",hostName);                 //设置SMTP主机
  }


 /**
  * @return boolean
  */
  public boolean createMimeMessage()
  {
    try{
      //System.out.println("准备获取邮件会话对象！");
      session = Session.getDefaultInstance(props,null);   //获得邮件会话对象
    }
    catch(Exception e){
      //System.err.println("获取邮件会话对象时发生错误！"+e);
      return false;
    }

    //System.out.println("准备创建MIME邮件对象！");
    try{
      mimeMsg = new MimeMessage(session);                 //创建MIME邮件对象
      mp = new MimeMultipart();

      return true;
    }
    catch(Exception e){
      //System.err.println("创建MIME邮件对象失败！"+e);
      return false;
    }
  }


 /**
  * @param need boolean
  */
  public void setNeedAuth(boolean need) {
	//  new javax.mail.PasswordAuthentication("","");
	//SmtpAuthenticator sa=new SmtpAuthenticator();
    //System.out.println("设置smtp身份认证：mail.smtp.auth = "+need);
    if(props == null)props = System.getProperties();

    if(need){
      props.put("mail.smtp.auth","true");
    }else{
      props.put("mail.smtp.auth","false");
    }
  }


 /**
  * @param name String
  * @param pass String
  */
//  public void setNamePass(String name,String pass) {
//    username = name;
//    password = pass;
//  }


 /**
  * @param mailSubject String
  * @return boolean
  */
  public boolean setSubject(String mailSubject) {
    //System.out.println("设置邮件主题！");
    try{
      mimeMsg.setSubject(mailSubject);
      return true;
    }
    catch(Exception e) {
      //System.err.println("设置邮件主题发生错误！");
      return false;
    }
  }


 /**
  * @param mailBody String
  */
  public boolean setBody(String mailBody) {
    try{
      BodyPart bp = new MimeBodyPart();
      bp.setContent("<meta http-equiv=Content-Type content=text/html; charset=gb2312>"+mailBody,"text/html;charset=GB2312");
      mp.addBodyPart(bp);

      return true;
    }
    catch(Exception e){
      //System.err.println("设置邮件正文时发生错误！"+e);
      return false;
    }
  }


 /**
  * @param name String
  * @param pass String
  */
  public boolean addFileAffix(String filename) {

 //System.out.println("增加邮件附件："+filename);

 try{
      BodyPart bp = new MimeBodyPart();
      FileDataSource fileds = new FileDataSource(filename);
      bp.setDataHandler(new DataHandler(fileds));
      bp.setFileName(fileds.getName());

      mp.addBodyPart(bp);

      return true;
    }
    catch(Exception e){
      //System.err.println("增加邮件附件："+filename+"发生错误！"+e);
      return false;
    }
  }


 /**
  * @param name String
  * @param pass String
  */
  public boolean setFrom( ) {
    //System.out.println("设置发信人！");
    //String from= mailServer.getEMAIL_MANAGER();
    try{
      mimeMsg.setFrom(new InternetAddress(from));             //设置发信人
      return true;
    }
    catch(Exception e)
    { return false; }
  }


 /**
  * @param name String
  * @param pass String
  */
  public boolean setTo(String to){
    if(to == null)return false;

    try{
      mimeMsg.setRecipients(Message.RecipientType.TO,InternetAddress.parse(to));
      return true;
    }
    catch(Exception e)
    {   return false;   }

  }

 /**
  * @param name String
  * @param pass String
  */
  public boolean setCopyTo(String copyto)
  {
    if(copyto == null)return false;
    try{
      mimeMsg.setRecipients(Message.RecipientType.CC,(Address[])InternetAddress.parse(copyto));
      return true;
    }
    catch(Exception e)
    { return false; }
  }


 /**
  * @param name String
  * @param pass String
  */
  public boolean sendout()
  {
    try{
      mimeMsg.setContent(mp);
      mimeMsg.saveChanges();
      //System.out.println("正在发送邮件....");

      Session mailSession = Session.getInstance(props,null);
      Transport transport = mailSession.getTransport("smtp");
      transport.connect((String)props.get("mail.smtp.host"),username,password);
      transport.sendMessage(mimeMsg,mimeMsg.getRecipients(Message.RecipientType.TO));
      //transport.send(mimeMsg);

      //System.out.println("发送邮件成功！");
      transport.close();

      return true;
    }
    catch(Exception e)
    {
      //System.err.println("邮件发送失败！"+e);
      return false;
    }
  }
 public boolean  sendEmail(String title,String mailbody,String to_email )
 {
 setNeedAuth(true);
  if( setSubject(title) == false) return false;
  if( setBody(mailbody) == false) return false;
  if( setTo(to_email)== false) return false;
  if( setFrom() == false) return false;
  if( sendout() == false) return false;
  return true;
 }

  /**
   *  Just do it as this
   */
 public static void main(String[] args) {
     String mailbody =  "测试邮件";
     SendMailAgent SendMailServer = new SendMailAgent();
     try {
       SendMailServer.sendEmail("测试", mailbody, "c.j.w_521@163.com");
     }
     catch (Exception e) {
     	System.out.println("发送邮件失败!"+e);
     }

  }
}