简单的Java邮件。无法在EHLO中设置本地主机名(如何设置mail.smtp.localhost?)

import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;

public class SimpleJavaMail {
    public static void main(String[] args) {
        // 设置邮件服务器主机名和端口号
        String host = "smtp.example.com";
        int port = 25;
        
        // 设置发件人和收件人
        String from = "sender@example.com";
        String to = "recipient@example.com";
        
        // 设置邮件内容
        String subject = "JavaMail测试邮件";
        String text = "这是一封测试邮件";
        
        // 设置属性
        Properties props = new Properties();
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.port", port);
        props.put("mail.smtp.localhost", "your-localhost-name"); // 设置本地主机名
        
        // 创建会话
        Session session = Session.getDefaultInstance(props);
        
        try {
            // 创建消息
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(from));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            message.setSubject(subject);
            message.setText(text);
            
            // 发送邮件
            Transport.send(message);
            
            System.out.println("邮件发送成功！");
        } catch (MessagingException e) {
            System.out.println("邮件发送失败：" + e.getMessage());
        }
    }
}