I do not manage a mailing list, since the one I have set is not active, but I found Mailman 3 to be too resource-hungry, so went with much more lightweight mlmm

I do not manage a mailing list, since the one I have set is not active, but I found Mailman 3 to be too resource-hungry, so went with much more lightweight mlmmj for mailing list management, and MHonArc for archiving. At least the initial setup is fairly easy with those, once you have postfix set. Probably not hard to set them with Exim, either, while Courier apparently includes mailing list functionality out of the box (though I have not tried that).