This version of procmail supports Maildir folders.
To make procmail to deliver into a Maildir folder, just append
a slash (/) to the name of the maildir folder in your ~/.procmailrc file.
For example, the following rule:
:0
* ^Resent-Sender.*[email protected]
debian-user/
will deliver all mail from the debian-user mailing list to the Maildir
folder "debian-user".