java代码: --------------------------------------------------------------------------------------- package com.lizongbo; import java.util.*; import javax.mail.internet.*; import javax.mail.*; /**  * <p>Title: javamail to 163 </p>  *  * <p>Description: 用javamail免认证方式发送邮件给163.com的用户,  * 具体原理不在此作详细解说,有兴趣者请自行查阅相关资料。  * /p>  *  * <p>Copyright: Copyright (c) 2005</p>  *  * <p>Company: lizongbo </p>  *  * @author lizongbo http://www.donews.net/lizongbo  * @version 1.0  */ public class JavaMail163 {   public static void main(String[] args) throws AddressException,       MessagingException {     Properties mailpro = new Properties();     mailpro.setProperty("mail.smtp.host", "202.108.44.210");     Session session = Session.getDefaultInstance(mailpro);     session.setDebug(true);     MimeMessage msg = new MimeMessage(session);     msg.setFrom(new InternetAddress("[email protected]"));     msg.setRecipient(Message.RecipientType.TO,                      new InternetAddress("[email protected]"));     msg.setSubject("测试免认证方式发送邮件!!!");     msg.setText("测试一下,邮件来自 http://www.donews.net/lizongbo ");     Transport.send(msg);   } } --------------------------------------------------------------------------------------- 执行结果: --------------------------------------------------------------------------------------- DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc] DEBUG SMTP: useEhlo true, useAuth false  DEBUG: SMTPTransport trying to connect to host "202.108.44.210", port 25
  DEBUG SMTP RCVD: 220 Coremail SMTP(Anti Spam) System (163com[20050206])
  DEBUG: SMTPTransport connected to host "202.108.44.210", port: 25
  DEBUG SMTP SENT: EHLO lizongbo
 DEBUG SMTP RCVD: 250-mx7 250-PIPELINING 250-AUTH LOGIN PLAIN NTLM 250-AUTH=LOGIN PLAIN NTLM 250 8BITMIME  DEBUG SMTP Found extension "PIPELINING", arg ""
 DEBUG SMTP Found extension "AUTH", arg "LOGIN PLAIN NTLM" DEBUG SMTP Found extension "AUTH=LOGIN", arg "PLAIN NTLM" DEBUG SMTP Found extension "8BITMIME", arg "" DEBUG SMTP: use8bit false DEBUG SMTP SENT: MAIL FROM:<[email protected]> DEBUG SMTP RCVD: 250 Ok  DEBUG SMTP SENT: RCPT TO:<[email protected]>
 DEBUG SMTP RCVD: 250 Ok  Verified Addresses
   [email protected] DEBUG SMTP SENT: DATA DEBUG SMTP RCVD: 354 End data with <CR><LF>.<CR><LF>  DEBUG SMTP SENT: 
 . DEBUG SMTP RCVD: 250 Ok: queued as NkBMWIV9KUKqYBoE.1  DEBUG SMTP SENT: QUIT
  
 
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