Evan Dodds blogs about Exchange clustering

Very cool: Evan Dodds of Microsoft has a blog about (drum roll) Exchange clustering. You should only go there if you want actual factual technical information, though; you’ll have to go somewhere else for $spin.
So, Evan, here’s a clustering question: can I force all outbound SMTP traffic on a cluster to originate from the IP address of the cluster instead of one of the physical nodes therein?