Send mail via Gmail / SMTP using Apache commons mail

ApacheCommonsEmailSenderMain.java

package rs.dodalovic.send_mail;

import org.apache.commons.mail.EmailException;
import org.apache.commons.mail.HtmlEmail;

import javax.mail.util.ByteArrayDataSource;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

public class ApacheCommonsEmailSenderMain {

    public static final String HOST_NAME = "smtp.gmail.com";
    public static final int PORT = 465;
    public static final String TEXT_PLAIN = "text/plain";

    public static void main(String[] args) throws IOException, EmailException {

        final String userName = args[0];
        final String password = args[1];
        final String recipientEmailAddress = args[2];
        final String attachmentLocation = args[3];

        HtmlEmail email = new HtmlEmail();
        email.setHostName(HOST_NAME);
        email.setSmtpPort(PORT);
        email.setSSLOnConnect(true);

        email.setAuthentication(userName, password);

        email.setSubject("Some subject");
        email.setFrom(userName, "Firstname Lastname", String.valueOf(StandardCharsets.UTF_8));
        email.addTo(recipientEmailAddress);
        email.setHtmlMsg("<h3>Message body</h3>");

        ByteArrayDataSource dataSource = new ByteArrayDataSource(new FileInputStream(attachmentLocation), TEXT_PLAIN);
        email.attach(dataSource, "attachment", "attachment");
        email.send();
    }

}