can't get rate limit to work

[Len Conrad]

mx1# postfwd -V
postfwd2 0.21 (Net::DNS 0.65, Net::Server 0.97, Sys::Syslog 0.27, Perl 5.008009 
on freebsd)

mx1# postfwd --showconfig -f /usr/local/etc/postfwd.conf | egrep SNDR
Rule   4: id->"SNDR_RATE_LIMIT"; action->"rate($$sender/10/60/450 4.7.1 
SNDR_RATE_LIMIT)"; client_address->"==;(.*)"

then I send 30 msgs within 5 seconds with same sender, but Rule 4 never fires.

Len