import javax.mail.*;
import javax.mail.internet.*;
  
public class EmailValidator {
    public static boolean validateEmail(String email) {
        boolean isValid = false;
  
        try {
            final String SMTP_HOST_NAME = "smtp.example.com"; // 替换为你的SMTP服务器
            final String from = "from@example.com"; // 替换为你的邮箱
  
            // 建立Session
            Properties props = new Properties();
            props.put("mail.smtp.host", SMTP_HOST_NAME);
            Session session = Session.getDefaultInstance(props, null);
  
            // 创建邮件
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(from));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(email));
            message.setSubject("Email Verification");
            message.setText("This is a test mail");
  
            // 发送邮件
            Transport.send(message);
  
            isValid = true;
        } catch (AddressException ae) {
            ae.printStackTrace();
        } catch (MessagingException me) {
            if (me.getNextException() instanceof SendFailedException) {
                // 邮箱不存在
                isValid = false;
            } else {
                me.printStackTrace();
            }
        }
  
        return isValid;
    }
  
    public static void main(String[] args) {
        String email = "user@example.com"; // 要验证的邮箱
        boolean isValid = validateEmail(email);
        System.out.println("Is email valid? " + isValid);
    }
}