Im looking for more automation, so that their email addresses are added to the ban list, prior to their "having come along to register" at our forum. I get 100-200 of these bounce emails a week because of spammers signing up with fake addresses. And 90% of those bounce email addresses are found on that website.

Its more of a proactive approach to known forum spammers, than a reactive one.

Something that should be looked into, imho; the owner of that site is always looking for input, so that his list can be made available to forum owners.