有关emai问题l出错

在运行时出错，希望大虾们指教
错误提示如下：


org.apache.commons.mail.EmailException: Sending the email to the following server failed : smtp.tom.com:25
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1138)
at org.apache.commons.mail.Email.send(Email.java:1163)
at com.v512.SendMailServlet.doPost(SendMailServlet.java:32)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Thread.java:619)



Caused by: javax.mail.AuthenticationFailedException
at javax.mail.Service.connect(Service.java:319)
at javax.mail.Service.connect(Service.java:169)
at javax.mail.Service.connect(Service.java:118)
at javax.mail.Transport.send0(Transport.java:188)
at javax.mail.Transport.send(Transport.java:118)
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1128)
... 18 more 程序代码如下：

sendMailServlet.java文件

package com.v512;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.mail.EmailException;
import org.apache.commons.mail.SimpleEmail;

public class SendMailServlet extends HttpServlet {

private static final long serialVersionUID = -9201649826567946642L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);

}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
SimpleEmail email = new SimpleEmail();
email.setHostName("smtp.sina.com");
email.setAuthentication("web08", "web2008");
email.setCharset("UTF-8");
try {
email.setFrom(request.getParameter("from"));
email.addTo(request.getParameter("to"));
email.setSubject(request.getParameter("subject"));
email.setMsg(request.getParameter("content"));
email.send();
request.setAttribute("sendmail.message", "邮件发送成功！");
} catch (EmailException e) {
e.printStackTrace();
request.setAttribute("sendmail.message", "邮件发送不成功！");
}
request.getRequestDispatcher("/sendResult.jsp").forward(request,
response);
}

}


<%@ page pageEncoding="UTF-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档 </title>
</head>


sendMeil.jsp 文件


<body>
<p align="center">发送邮件的程序 </p>
<form id="form1" name="form1" method="post" action=" <%=request.getContextPath()%>/servlet/sendMail">
<table width="516" height="253" border="0" align="center">
<tr>
<td>收件人： </td>
<td> <label>
<input type="text" name="to" id="to" />
</label> </td>
</tr>
<tr>
<td>发件人： </td>
<td> <label>
<input type="text" name="from" id="from" />
</label> </td>
</tr>
<tr>
<td>主题： </td>
<td> <label>
<input type="text" name="subject" id="subject" />
</label> </td>
</tr>
<tr>
<td>内容： </td>
<td> <label>
<textarea name="content" id="content" cols="45" rows="8"> </textarea>
</label> </td>
</tr>
<tr>
<td> <label>
<input type="submit" name="button" id="button" value="提交" />
</label> </td>
<td> <label>
<input type="reset" name="button2" id="button2" value="重置" />
</label> </td>
</tr>
</table>
</form>
<p align="center">  </p>
<p>  </p>
</body>

</html>


sendResult.jsp文件

<%@ page language="java" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

<title>display upload result </title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>
<center>
<p> ${requestScope['sendmail.message'] } </p>
</center>
</body>
</html>