使用MailSender发送简单邮件的问题

Question

各位大侠们教教小弟这个是怎么回事??
为什么发送邮件的时候会出现
Authentication failed: null; nested exception is javax.mail.AuthenticationFailedException 的异常?请问要如何解决？我在Spring中的配置是 <bean id="mailMessage" class="org.springframework.mail.SimpleMailMessage">
<property name="from">
<value>[email protected]</value>
</property>
<property name="subject">
<value>竞价通知</value>
</property>
</bean>

<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
<property name="host">
<value>smtp.163.com</value>
</property>
<property name="javaMailProperties">
<props>
<prop key="mail.smtp.auth">true</prop>
<prop key="mail.smtp.timeout">25000</prop>
</props>
</property>
<property name="username">
<value>wangspringtext</value>
</property>
<property name="password">
<value>9706171com</value>
</property>

</bean>
注意: wangspringtext用户名和密码我可以在mail.163.com 网站上正常登录:下面是我发送邮件的代码:
                                 private BidDao bidDao;
                         private AuctionUserDao auctionUserDao;
                         private ItemDao itemDao;
                         private SimpleMailMessage message;
                         private MailSender mailSender;
                                   
                                 setter方法省略 SimpleMailMessage msg = new SimpleMailMessage(this.message);
System.out.println(au.getEmail());
msg.setTo(au.getEmail());
msg.setText(
"Dear" + au.getUsername() + ", 谢谢你参与竞价，你的竞价的物品的是: " + item.getItemName()

);

try
{
System.out.println("ghghgh");
mailSender.send(msg);
}
catch(Exception ex)
{
System.err.println(ex.getMessage());
}
注意:
mailSender.send(msg);　上面的System.out.println("ghghgh");能正常输出