You mean folks are required to read and understand BEFORE they post?  If
so, I'd like to know how ;-)  You could temporarily moderate your
subscribers' postings pending some future delivery and time differences;
they give it another couple of hours for it to sink in, as well as those
folks who read and post sequentially, followed up by those who must let
no good deed go unpunished by responding to someone else on-list who did
not read things in the same order that they did.

/Pete