[Exim] Canned clue?

Someone on here once had posted a canned clue-brick type of message
that they used to send to admins who had either accidentally or
intentionally disabled reception of MAIL FROM:<> , but I cant seem to
find it.

I have to deal with such a case at the moment, and don't have time to
cruft together a nice explanatory email, I would appreciate if whoever
had that could repost it...