Follow-up dspam/postfix question

[David Bishop <tech@gnuconsulting.com>]

So I'm pretty close to done with my Grand Mail Conversion experiment.
The only thing I haven't figured out how to do is to filter mail that
I'm just relaying.  I have the following in my master.cf:
smtp      inet  n       -       n       -       -       smtpd
dspam     unix  -       n       n       -       10      pipe
 flags=Ru user=dspam argv=/usr/bin/dspam --deliver=innocent
  --user ${recipient} -i -f $sender -- $recipient

and in my main.cf:
smtpd_client_restrictions=
 permit_sasl_authenticated
 permit_mynetworks
 check_client_access cidr:/etc/postfix/client_restrictions

In client_restrictions:
0.0.0.0/0 FILTER dspam:

And mail that comes in for someone on my server gets filtered.  Mail
that comes in and goes right back out (the whole mx relay 'thing')
doesn't get filtered.  What magic switch am I missing?

David