Quoting Michael Paoli (Michael.Paoli@cal.berkeley.edu):
Also, most of the @balug.org infrastructure is in place and about ready to go ... I just need to tweak MTA (exim4) config very slightly at the time of DNS switchover - but it's been fairly well tested thus far.
The antispam's the difficult bit, so props to you for working through that.
I'll likely put some more details up later about that ... more notably after I've tested further, and see how much I'm able to feasibly improve it without having to spend too much time mucking about with it).
I'd really love to use your work as the basis for a 'how to construct a modern MTA/MLM server on Debian w/Exim, Mailman, sa-exim, and EximConfig + various tweaks' HOWTO / recipe. For one thing, I might have use for it soon.
I mean yes, I've done all of that before, but always in a hurry without keeping meticulous notes.