An example to send HTML mail with attachment in java. No ssl/tls. Raw

SendMail.java

package me.fponzi;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import java.io.File;
import java.util.Date;
import java.util.Properties;

public class SendMail
{
    private final Properties props;
    private final Session session;
    private MimeMultipart multipart;
    private MimeMessage message;
    
    public SendMail(String username, String password, String smtp, String port)
    {
        //Set the host smtp address
        this.props = new Properties();
        props.put("mail.smtp.host", smtp);
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", port);
        
        // create some properties and get the default Session
        this.session = Session.getDefaultInstance(props, new Authenticator()
        {
            @Override
            protected PasswordAuthentication getPasswordAuthentication()
            {
                
                return new PasswordAuthentication(username, password);
            }
        });
        session.setDebug(false);
        message = new MimeMessage(this.session);
        multipart = new MimeMultipart();
    }
    
    public SendMail createMail(String recipients[], String from, String subject) throws MessagingException
    {
        
        
        // set the from and to address
        InternetAddress addressFrom = new InternetAddress(from);
        message.setFrom(addressFrom);
        
        InternetAddress[] addressTo = new InternetAddress[recipients.length];
        for (int i = 0; i < recipients.length; i++)
        {
            addressTo[i] = new InternetAddress(recipients[i]);
        }
        
        message.setRecipients(Message.RecipientType.TO, addressTo);
        
        message.setSubject(subject);
        message.setSentDate(new Date());
        return this;
    }
    
    public SendMail addHTMLMessage(String body) throws MessagingException
    {
        MimeBodyPart messageBodyPart = new MimeBodyPart();
        messageBodyPart.setText(body, "UTF-8", "html");
        multipart.addBodyPart(messageBodyPart);
        return this;
    }
    
    public SendMail addAttachment(File f, String filename) throws MessagingException
    {
        BodyPart messageBodyPart = new MimeBodyPart();
        DataSource source = new FileDataSource(f);
        messageBodyPart.setDisposition(Part.ATTACHMENT);
        messageBodyPart.setDataHandler(new DataHandler(source));
        messageBodyPart.setFileName(filename);
        multipart.addBodyPart(messageBodyPart);
        return this;
    }
    
    public void send() throws MessagingException
    {
        // create a multipart
        message.setContent(multipart);
        Transport.send(message);
    }
    
    public static void main(String args[]) throws Exception
    {
    
        SendMail sendMail = new SendMail("username", "password", "mail.server.com", "port");
        sendMail.createMail(new String[]{"[email protected]", "[email protected]"}, "[email protected]", "Hello, World!")
                .addAttachment(new File("/home/fponzi/colosseo.jpg"), "Colosseo.jpg")
                .addHTMLMessage("<strong>Hello, World!</strong>");
    }
}