Archive maildir

Hi to all We have a maildir with about 180GB of emails. We have to archive them to a structure like: .Archive.YYY./MM.folder

Are you aware of a script doing this ? I've found a perl script that doesn't spit in year and month and a very, very, very, very, very old python script that:

1. doesn't manage base64 encoded subject properly
2. doesn't work with python 3.x (that is able to manage base64 encoded subject properly

Any idea ?