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spamd & grey-listing innovation

I've noticed that most spam that I receive is directed to old/nonexistent mail 
addresses. Sadly my mail server reply with an "error" message and so keep 
wasting precious bandwidth.
I think that adding a new file containing only valid addresses could be an 
useful innovation. The trick is that spamd would add the grey-listing triplet 
to its database only if the destination address is present in the upsaid file 
(/etc/spamd.addresses ?).
This will permit to save a lot of bandwidth and to move some load from the 
mail server to the firewall.
Who likes it ?