With the long awaited access control list for Distribution Lists, how do I
set up a Distribution List that sends email to every Post Office or Domain,
rather than to individual employees? With a personal distribution list, I
can use wildcards, but fail to see how I can do so with a Corporate
Distribution List. I'd like to have this available so that we don't have to
update membership and that we can control who can send to it.

I will also be blocking the email address upstream so that folks from the
internet can't send to it.