[Dovecot] Dovecot deliver and procmail

Hi, I have site w. around 7000 users, most of which have some procmail rules (theres even .procmailrc in /etc/skel with rule to put spam into spam folder). Afaik dovecot's deliver doesnt understand procmail rules, so i'd like to ask if its possible to configure procmail so it saves mail using deliver, without modifying users .procmailrc

Thanks for any pointers, Vaclav Hula