Do I need the 'w' flag?

On the below recipe, should I have a 'w' flag in there?  The reason I am
asking is that I've been experiencing some intermittent false negatives
(i.e., people on the friends' list slipping by this filter sometimes and 
other times they pass thru).  I can post extended diagnostic information
if the answer isn't an obvious "Yes".

Thanks.

        FROM=`$FORMAIL -rt -x'To:'`

        #
        # Check to see if this email is from a "friend".  If so, stick it
        # in my INBOX.
        #
        :0:
        * $FROM ?? ? grep -F -i -f $HOME/friends
        $ORGMAIL

Lates!
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Tim <bodysurf(_at_)pobox(_dot_)com>                  
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