...
Something like courier's MAXRCPT, but counting per day instead of per message. Something that says "no single IP in the range a.b.c.d/x can send to more than 1000 recipients per day, no matter what". A default limit which no normal user will ever run into, but which would all the same make the service useless to any spammer. This would allow ISPs to put a limit to their own customers, while still accepting any amount of mail from "foreign" servers. That, in turn, would invalidate the whole concept of throwaway accounts.
First mail server to offer the feature wins the year's anti-spam awards ;)
I didn't get around to working on that for a while, but the filter only took about an hour to write:
http://phantom.dragonsdawn.net/~gordon/courier-patches/courier-pythonfilter/
The "ratelimit" version included in 0.4 should work. I wouldn't recommend using the dialback filter at this point, though. There are some problems with it that I'm beginning to think are just a deadlock in python itself. If you install the software, exclude that filter.
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