[Dovecot] Multiple folders/fetchmail

Hi,

my emails are processed using procmail and stored the following way:

/home/ajung/Maildir/new|cur|tmp /home/ajung/Maildir/Plone|new|cur|tmp /home/ajung/Maildir/Python|new|cur|tmp

When I fetch my mail using fetchmail I can only get the mails from "Maildir". However I can not access other folders like "Plone" or "Python" (using fetchmail -r Plone). I tried to tweak mail_default_env but without access. So any ideas how to configure dovecot the way I need it?

Thanks in advance, Andreas