gruymail.java

//usr/bin/env jbang "$0" "$@" ; exit $?
//DEPS info.picocli:picocli:4.2.0
//DEPS org.jodd:jodd-mail:5.1.5

import jodd.mail.EmailFilter;
import jodd.mail.ImapServer;
import jodd.mail.MailServer;
import jodd.mail.ReceiveMailSession;
import jodd.mail.ReceivedEmail;
import picocli.CommandLine;
import picocli.CommandLine.Command;

import java.util.concurrent.Callable;

import static java.lang.System.out;

@Command(name = "gruymail", mixinStandardHelpOptions = true, version = "gruymail 0.1",
        description = "gruymail made with jbang")
class gruymail implements Callable<Integer> {

    @CommandLine.Option(names={ "--host"}, defaultValue = "imap.googlemail.com", required = true)
    private String host;

    @CommandLine.Option(names={ "--user"}, required = true)
    private String user;

    @CommandLine.Option(names={"--debug"})
    boolean debug;

    @CommandLine.Option(names={"--password"}, required = true)
    private String password;

    public static void main(String... args) {
        int exitCode = new CommandLine(new gruymail()).execute(args);
        System.exit(exitCode);
    }

    @Override
    public Integer call() throws Exception { // your business logic goes here...

        out.println("Login...");
        ImapServer imapServer = MailServer.create()
                .host(host)
                .ssl(true)
                .auth(user, password)
                .debugMode(debug)
                .buildImapMailServer();


        out.println("Open...");
        ReceiveMailSession session = imapServer.createSession();
        session.open();


        EmailFilter anylistid = EmailFilter.filter()
                .header("List-Id", "*");

        out.println("Search...");
        var mails = session.receive().envelopeOnly()
                .filter(anylistid)
                .get();

        out.println("Found " + mails.length);

        for (ReceivedEmail mail:mails
             ) {
            out.println(mail.header("List-Id"));
        }
        session.close();
        return 0;
    }
}