setting up mailing list using procmail

hi :

thanks to the replies i got from people on this list, i was able to set up a
small mailing list using procmail. i did the following:

:0 
* ^TO(_dot_)*list(_at_)mydomain(_dot_)org
{
        :0 c:
        list
        :0
        | (formail -A "Reply-To: list(_at_)mydomain(_dot_)org" \
        -A "X-Mailing-List: Mailing List @mydomain.org") \
        | $SENDMAIL -oi user1(_at_)somedomain(_dot_)com \
                user2(_at_)someotherdomain(_dot_)com \
                user3(_at_)yetanotherdomain(_dot_)com 
}


the question i have is, is it going to be a big performance problem if i 
have like 500 users on this list? 

thanks a lot for the help.

--
"Drums, guitar and Death. They finally got it right."
                                - Beavis & Butthead