Is it possible to not use client_ip?

My first post to this list, please be gentle...     :)

Is it possible to NOT consider the client_ip when using postgrey?

My problem is we just switched to load balancing and the incoming emails 
always seem like they come from the same IP address.... The load 
balancer so the email all look like the come form the same IP

Would postgrey still be useful if it checked only the to and from ?

Thanks to all..

-- 

Rob Morin
Dido Internet Inc.
Montreal,Canada
http://www.dido.ca
514-990-4444