Code

public class SendMessageUtils {

    // sender account and password
    public static final String MY_EMAIL_ACCOUNT = "Your email  [email protected]";
    public static final String MY_EMAIL_PASSWORD = "The authorization code you set (not your email password)";

    // SMTP server (163 SMTP server used here)
    public static final String MEAIL_163_SMTP_HOST = "smtp.163.com";
    public static final String SMTP_163_PORT = "25";// Port number, this is used by 163; QQ should be 465 or 875

    // recipient
    public static final String RECEIVE_EMAIL_ACCOUNT = "***@**.com";// The email you want to send

    public static void main(String[] args) throws AddressException, MessagingException {
        Properties p = new Properties();
        p.setProperty("mail.smtp.host", MEAIL_163_SMTP_HOST);
        p.setProperty("mail.smtp.port", SMTP_163_PORT);
        p.setProperty("mail.smtp.socketFactory.port", SMTP_163_PORT);
        p.setProperty("mail.smtp.auth", "true");
        p.setProperty("mail.smtp.socketFactory.class", "SSL_FACTORY");

        Session session = Session.getInstance(p, new Authenticator() {
            // Set authentication account information
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(MY_EMAIL_ACCOUNT, MY_EMAIL_PASSWORD);
            }
        });
        session.setDebug(true);
        System.out.println("Create Message");
        MimeMessage message = new MimeMessage(session);
        // From
        message.setFrom(new InternetAddress(MY_EMAIL_ACCOUNT));
        // recipient and cc
        message.setRecipients(Message.RecipientType.TO, RECEIVE_EMAIL_ACCOUNT);
//		message.setRecipients(Message.RecipientType.CC, MY_EMAIL_ACCOUNT);

        // Content (This content cannot be written yet, it may be rejected by SMTP; try it a few times)
        message.setSubject("file");
        message.setContent("<h1> Beautiful Mushroom Cool </ h1>", "text/html;charset=UTF-8");
        message.setSentDate(new Date());
        message.saveChanges();
        System.out.println("Ready to send");
        Transport.send(message);
    }
}

The jar package to be referenced

    <dependency >
        <groupId >com.sun.mail </groupId >
        <artifactId >javax.mail </artifactId >
        <version >1.5.4 </version >
    </dependency >

Open your mailbox to set the authorization code