Servlet使用SmtpClient发送邮件需要验证身份

Question

package servlet.mail;

import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import sun.net.smtp.SmtpClient;

/**
 * @author shiwx
 * @since 2011-12-5
 * @version 1.0
 */
public class MailServlet extends HttpServlet {
	private static final long serialVersionUID = 6204547780699076040L;

	public static String MAIL_FROM = "shiwx@asiainfo-linkage.com";
	public static String MAIL_TO = "dongbt@asiainfo-linkage.com";
	public static String MAIL_HOST = "smtp.asiainfo-linkage.com";
	
	/**
	 * Servlet使用SmtpClient发送邮件
	 */
	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		resp.setContentType("text/html;charset=utf-8");
		PrintWriter out = resp.getWriter();
        
		SmtpClient mailer = new SmtpClient(MAIL_HOST);
		mailer.from(MAIL_FROM);
		mailer.to(MAIL_TO);
		
		PrintStream ps = mailer.startMessage();
		ps.println("From: " + MAIL_FROM);
		ps.println("To: " + MAIL_TO);
		ps.println("Subject: " + "MAIL_TITLE");
		ps.println("MAIL_BODY");
		ps.flush();
		ps.close();
		
		mailer.closeServer();
		out.println("<h2>Your email has been sent!</h2>");
		out.flush();
		out.close();
	}

	@Override
	public void destroy() {
		super.destroy();
	}

	@Override
	public void init() throws ServletException {
		super.init();
	}
}

Servlet使用SmtpClient发送邮件需要验证身份，

报异常：553 From <shiwx@asiainfo-linkage.com>, message blocked, you are not authorized to send mail, authentication is required.

请问使用SmtpClient如何处理身份验证？下面是代码

 

Answer 1

引用来自“红薯”的答案

建议用
commons-email 包，封装了邮件发送的过程，支持用户认证很方便

Answer 2

发邮件需要用户名和密码认证的

Answer 3

建议用
commons-email 包，封装了邮件发送的过程，支持用户认证很方便