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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.FileInputStream;
import java.util.Properties;

import jakarta.mail.Session;
import jakarta.mail.internet.MimeBodyPart;
import jakarta.mail.internet.MimeMessage;

import org.bouncycastle.cms.jcajce.ZlibExpanderProvider;
import org.bouncycastle.mail.smime.SMIMECompressed;
import org.bouncycastle.mail.smime.SMIMEUtil;

/**
 * a simple example that reads a compressed email.
 * 
 */
public class ReadCompressedMail
{
    public static void main(
        String args[])
        throws Exception
    {
        //
        // Get a Session object with the default properties.
        //         
        Properties props = System.getProperties();

        Session session = Session.getDefaultInstance(props, null);

        MimeMessage msg = new MimeMessage(session, new FileInputStream("compressed.message"));

        SMIMECompressed     m = new SMIMECompressed(msg);

        MimeBodyPart        res = SMIMEUtil.toMimeBodyPart(m.getContent(new ZlibExpanderProvider()));

        System.out.println("Message Contents");
        System.out.println("----------------");
        System.out.println(res.getContent());
    }
}