Alibaba Mail:Java Call Example of Email Download by IMAP

import java.io.FileOutputStream;
import java.io.File;
import java.util.Properties;
import javax.mail.*;

public class ImapEmailDownloader {
    public static void main(String[] args) {
        // Configure the email server.
        String host = "";
        String username = "";
        String password = "";
        // Configure the connection properties.
        Properties properties = new Properties();
        properties.put("mail.store.protocol", "imap");
        properties.put("mail.imap.host", host);
        properties.put("mail.imap.port", "993");
        properties.put("mail.imap.ssl.enable", "true");
        //properties.put("mail.imap.ssl.protocols", "TLSv1.2"); //If you encounter an error SSLHandShakeException, please try this option

        // The local folder path. Please replace it with the actual folder path. 
        String folderPath = "D :\\ Folder 1\\Folder 1-1";

        try {
            // Create a session object.
            Session session = Session.getDefaultInstance(properties);
            // Connect to the mail server.
            Store store = session.getStore();
            store.connect(username, password);
            // Open the inbox.
            Folder inbox = store.getFolder("INBOX");
            inbox.open(Folder.READ_ONLY);
            // Obtain the email list.
            Message[] messages = inbox.getMessages();
            // Traverse emails and download emails in the EML format.
            for (Message message : messages) {
                String subject = message.getSubject();
                String fileName = subject + ".eml";
                // Build the path of the local file.
                String filePath = folderPath + File.separator + fileName;
                // Download the email to the local folder.
                FileOutputStream fos = new FileOutputStream(filePath);
                message.writeTo(fos);
                System.out.println("Download email:" + fileName);
            }
            // Close the connection.
            inbox.close(false);
            store.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}