Mark Sapiro writes:
I have no idea exactly what fraction of Mailman lists are configured with personalized footers, but I suspect it's significant.
@John: Sorry, I definitely was assuming personalization; I should have said so.
I think personalization is quite a desirable feature in some contexts. All of my educational lists have personalized footers (subscribers min 5, max 20, mean 7 -- tiny, or "nano" if you prefer). I would guess lists with "naive" users are more likely to want to personalize.
OTOH, XEmacs lists are ancient, they don't personalize. Emacs-devel (probably by Savannah policy) doesn't have them at all. python-dev and python-ideas *do* have personalized footers (maybe somebody here knows how many subscribers?) Sourceforge's weekly ping doesn't have a footer, the monthly news letter does. (Of course those SF lists aren't discussion lists, but it's indicative of expectations among developers -- we probably don't need them. It also shows that lists with many thousands of users sometimes use personalized footers, at least if they're low-traffic.)