> I thought there was a way of forbidding posting to the list
> except if the sender was a member of the list.
I agree. But as someone pointed out, we do regularly get new users with
queries about Maxima, and we don't want to discourage them.
I don't know what mailing list software is currently being used (and
apparently it is hard to administer because it is at Utexas), but it
should be possible to have a compromise policy: registered users can
post without moderation, but mail from unregistered people gets
moderated. Surely that is a standard policy setting for *some* mailing
list software. Now it's just a "small matter of implementation".
-s
PS As it happens, I have seen zero spam from the Maxima list recently.
(Though there was some a couple of months ago.) Perhaps my ISP's spam
filter is effective?