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The Bouncy Castle Java S/MIME APIs for handling S/MIME protocols. This jar contains S/MIME APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs. The Jakarta Mail API and the Jakarta activation framework will also be needed.

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package org.bouncycastle.mail.smime.examples;

import java.io.FileOutputStream;
import java.util.Properties;

import jakarta.mail.Address;
import jakarta.mail.Message;
import jakarta.mail.Session;
import jakarta.mail.internet.InternetAddress;
import jakarta.mail.internet.MimeBodyPart;
import jakarta.mail.internet.MimeMessage;

import org.bouncycastle.cms.jcajce.ZlibCompressor;
import org.bouncycastle.mail.smime.SMIMECompressedGenerator;

/**
 * a simple example that creates a single compressed mail message.
 */
public class CreateCompressedMail
{
    public static void main(
        String args[])
        throws Exception
    {
        //
        // create the generator for creating an smime/compressed message
        //
        SMIMECompressedGenerator  gen = new SMIMECompressedGenerator();
          
        //
        // create the base for our message
        //
        MimeBodyPart    msg = new MimeBodyPart();

        msg.setText("Hello world!");

        MimeBodyPart mp = gen.generate(msg, new ZlibCompressor());

        //
        // Get a Session object and create the mail message
        //
        Properties props = System.getProperties();
        Session session = Session.getDefaultInstance(props, null);

        Address fromUser = new InternetAddress("\"Eric H. Echidna\"");
        Address toUser = new InternetAddress("[email protected]");

        MimeMessage body = new MimeMessage(session);
        body.setFrom(fromUser);
        body.setRecipient(Message.RecipientType.TO, toUser);
        body.setSubject("example compressed message");
        body.setContent(mp.getContent(), mp.getContentType());
        body.saveChanges();

        body.writeTo(new FileOutputStream("compressed.message"));
    }
}