Now when I get an email, I can just reply with that. I still don't like it, but it's better than deleting their emails. :/
I seem to recall a page elsewhere on the Internet that said this same thing (perhaps a bit more politely than I did?) but I couldn't find it so I had make my own. Any pointers to similar pages, or tips on how to improve mine?
I should probably recruit some moderation people to deal with the Mailman moderation queue (which I can't seem to turn off?! where is the members-only-can-post option?). Or is it rude to just bounce (forward as their from address) their email to me to the list directly?