Condition to execute rule

Hi,

I have a rule in /home/user1/.procmailrc, which is executed every time 
user user1 gets an email:
:0 c
! address(_at_)domain(_dot_)org

What's the correct condition if I want to delete that rule from 
/home/user1/.procmail and insert it into /etc/procmailrc so it's 
executed if and only if that user gets an email?
:0 c
* CONDITION?
! address(_at_)domain(_dot_)org

Cheers
Patrick Häcker

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