发邮件失败，

错误信息

org.apache.commons.mail.EmailException: Sending the email to the following server failed : smtp.163.com:25

	at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1138)

	at org.apache.commons.mail.Email.send(Email.java:1163)

	at email.MailUtil.send(MailUtil.java:37)

	at email.MailUtil.main(MailUtil.java:59)

Caused by: javax.mail.AuthenticationFailedException

	at javax.mail.Service.connect(Service.java:306)

	at javax.mail.Service.connect(Service.java:156)

	at javax.mail.Service.connect(Service.java:105)

	at javax.mail.Transport.send0(Transport.java:168)

	at javax.mail.Transport.send(Transport.java:98)

	at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1128)

	... 3 more

package email;



	import java.io.Serializable;



	/**

	 * Mail属性实体

	 * 

	 * 

	 */

	@SuppressWarnings("serial")

public class Mail implements Serializable {



	public static final String ENCODEING = "UTF-8";



	private String host; // 服务器地址



	private String sender; // 发件人的邮箱



	private String receiver; // 收件人的邮箱



	private String name; // 发件人昵称



	private String username; // 账号



	private String password; // 密码



	private String subject; // 主题



	private String message; // 信息(支持HTML)



	public String getHost() {

		return host;

	}



	public void setHost(String host) {

		this.host = host;

	}



	public String getSender() {

		return sender;

	}



	public void setSender(String sender) {

		this.sender = sender;

	}



	public String getReceiver() {

		return receiver;

	}



	public void setReceiver(String receiver) {

		this.receiver = receiver;

	}



	public String getName() {

		return name;

	}



	public void setName(String name) {

		this.name = name;

	}



	public String getUsername() {

		return username;

	}



	public void setUsername(String username) {

		this.username = username;

	}



	public String getPassword() {

		return password;

	}



	public void setPassword(String password) {

		this.password = password;

	}



	public String getSubject() {

		return subject;

	}



	public void setSubject(String subject) {

		this.subject = subject;

	}



	public String getMessage() {

		return message;

	}



	public void setMessage(String message) {

		this.message = message;

	}



}

package email;





	import org.apache.commons.mail.EmailException;

import org.apache.commons.mail.HtmlEmail;

import org.apache.log4j.Logger;



	/**

	 * 邮件发送工具实现类

	 * 

	 * @author shadow

	 * @create 2013/07/12

	 */

	public class MailUtil {



		protected final Logger logger = Logger.getLogger(getClass());



		public boolean send(Mail mail) {

			// 发送email

			HtmlEmail email = new HtmlEmail();

			try {

				// 这里是SMTP发送服务器的名字：163的如下："smtp.163.com"

				email.setHostName(mail.getHost());

				// 字符编码集的设置

				email.setCharset(Mail.ENCODEING);

				// 收件人的邮箱

				email.addTo(mail.getReceiver());

				// 发送人的邮箱

				email.setFrom(mail.getSender(), mail.getName());

				// 如果需要认证信息的话，设置认证：用户名-密码。分别为发件人在邮件服务器上的注册名称和密码

				email.setAuthentication(mail.getUsername(), mail.getPassword());

				// 要发送的邮件主题

				email.setSubject(mail.getSubject());

				// 要发送的信息，由于使用了HtmlEmail，可以在邮件内容中使用HTML标签

				email.setMsg(mail.getMessage());

				// 发送

				email.send();

				if (logger.isDebugEnabled()) {

					logger.debug(mail.getSender() + " 发送邮件到 " + mail.getReceiver());

				}

				return true;

			} catch (EmailException e) {

				e.printStackTrace();

				logger.info(mail.getSender() + " 发送邮件到 " + mail.getReceiver()

						+ " 失败");

				return false;

			}

		}

		

		public static void main(String[] args) {

			Mail mail = new Mail();

			mail.setHost("smtp.163.com"); // 设置邮件服务器

			  mail.setSender("15116402920@163.com"); //发件人

			mail.setReceiver("115116402920@163.com"); // 接收人

			mail.setUsername("15116402920@163.com"); // 登录账号

			mail.setPassword("xxx"); // 发件人邮箱的登录密码

			mail.setSubject("标题");

			mail.setMessage("内容");

			new MailUtil().send(mail);

		}



	}

163邮箱服务是开启的（）。jar包也有导入（activation-1.1.jar、commons-email-1.1.jar、mail-1.4.jar）
奇怪了