You know? I suddenly realised what I consider important in a mailing list software (with moderation, filters and other goodies). The ability to transparently impose administrative policy on multiple lists lists in one go.
Background would be "I have several Mailman lists on common- lisp.net" (where "several" is, I believe, 8) and they do, of course, get spam. But, I essentially do NOT use any of Mailman's spam-fighting measures (there's a few "just drop" non-subscriber from-address regexps and a "moderate all non- subscriber posts") because while all the lists get spam, any measure needs to be duplicated to all the lists to be worth the effort and that is WAY too much like actual work.
Of course, as these things go, I fully expect that someone will tell me "install the Blahonga module and you get it" or "buh, all you need to to is to frob around in the config and it's there!" and that would be fine, too. Until then, I will keep deleting 1-5 spam emails from 2-6 lists daily (no, not all lists are hit in parallel, some are also more attractive than others, it's all probably worthy of having been data-collected and charted).