I was also looking for the best Maildir converter, and this post helped me out. But I also found the best tool to convert Maildir to PST. You can use the MacSonik Maildir Converter for Mac, which is the best tool to convert Maildir files into multiple saving options. This tool safely converts Maildir files to PDF, MBOX, EML, HTML, MSG, CSV, and many other formats. You can also split large Maildir files into smaller ones, reducing size while keeping emails, contacts, and calendars intact.

Read More: https://www.macsonik.com/maildir-converter/