[Exim] extended addresses and procmail

Hi. I am using extended addresses like user.something@???, so I can
separate certain type of mail, like newsletter subscriptions. The problem I
am having is that, when I receive those mails, they don't get through the
procmail rules, but land directly on my Inbox.
Does anyone have ideas of why procmail isn't filtering these mails? (when I send
the same mail to the address user@???, the mail gets filtered, so
the procmail recipes are working)

With regards

Ricardo Kirkner