Send mail use java mail api

SendMail.java

import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import java.util.*;

public class SendMail {

    private void send(String sender, String recipient, String headline, String content) throws Exception{
        List<Long> updateIds = new ArrayList<Long>();
        String host = "smtp.host";

        Properties props = System.getProperties();
        // proxy like this is your java mail api version >=1.4.5
        // Use this proxy on a per-session, per-protocol basis
        props.setProperty("mail.smtp.socks.host", "proxy.host.ip");
        props.setProperty("mail.smtp.socks.port", "proxy.host.port");
        
        
        //proxy like this if your java mail api version < 1.4.5
        // this may proxy on jvm level(so just use the way above)
        //props.setProperty("proxySet", "true");
        //props.setProperty("socksProxyHost", "proxy.host.ip");
        //props.setProperty("socksProxyPort", "proxy.host.port");

        // print debug message
        props.put("mail.debug", "true");

        //if you hava a password
//        String proxyUsername = "username";
//        String proxyPassword = "password";
//        java.net.Authenticator authenticator = new java.net.Authenticator() {
//
//            protected java.net.PasswordAuthentication getPasswordAuthentication() {
//                return new java.net.PasswordAuthentication("", password.toCharArray());
//            }
//        };
//
//        System.setProperty("java.net.socks.username", username);
//        System.setProperty("java.net.socks.password", password);
//        java.net.Authenticator.setDefault(authenticator);

        // 设置SMTP的主机
        props.put("mail.smtp.host", host);
        props.put("mail.transport.procotol", "smtp");
        // 不需要经过验证
        props.put("mail.smtp.auth", "false");

        Session session = Session.getInstance(props);

        //建立邮件内容
        MimeMessage msg = new MimeMessage(session);
        //设置邮件内容格式为混合内容
        MimeMultipart msgMultipart = new MimeMultipart("mixed");
        msg.setContent(msgMultipart);

        MimeBodyPart bodyPart = new MimeBodyPart();
        msgMultipart.addBodyPart(bodyPart);

        //设置html内容
        bodyPart.setContent(content, "text/html;charset=utf-8");
        msg.setSentDate(new Date());
        //设置发件人地址
        msg.setFrom(new InternetAddress(sender));
        //设置标题
        msg.setSubject(headline);
        //发送邮件
        Transport transport = session.getTransport("smtp");
        transport.connect();
                transport.sendMessage(msg, new InternetAddress[]{new InternetAddress(rcpt.getValue())});
        transport.close();
    }

    public static void main(String[] args) {
        try {
            new SendMail().send("sender@mail.host.com", "recipient@mail.host.com", "Hello", "Have a nice day!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}