这段非常简单的JavaMail程序怎么会有错?

[姓庄滴]

Properties mailpro = new Properties();
mailpro.setProperty("mail.smtp.host", "smtp.163.com");
Session session = Session.getDefaultInstance(mailpro);
session.setDebug(true);
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("[e-mail]"));
msg.setRecipient(Message.RecipientType.TO,new InternetAddress("[e-mail]"));
msg.setSubject("test");
msg.setText("this is a test");
Transport.send(msg);
System.out.println("send succeed!");

以上程序段,是用来发送邮件的.
我是在网上搜的例子,但我运行,没有编译错误.但不能成功发送邮件.怎么回事?

[linuxbing]

需要向服务器提供你的用户名和密码
mailpro.put("mail.smtp.auth","true");
Session session = Session.getInstance(mailpro,new Authenticator(username,password){
private String userName,password;

/**
* To store a userName and pasword to the authenticator
* @param userName user's name
* @param password user's passwored
*/
public SimpleAuthenticator(String userName,String password){
this.userName = userName;
this.password = password;
}

/**
* Overide Authenticator method
*/
protected PasswordAuthentication getPasswordAuthentication(){
PasswordAuthentication pass = new PasswordAuthentication(userName,password);
return pass;
}
})

[sole_lodestar]

建议楼主在这里搜一下邮件相关的主题

[rickhunterchen]

如果你利用外网的邮件服务器发邮件，就肯定要身份验证，要不163知道你是谁呀。