[Mailman-Users] Changing "From:" in header..

I'm managing 2 mail lists using MM 2.1.38 in cpanel. I set up a list last year and another list in the last couple months. As far as I can tell, both lists have the same options set in general. However, the new list has a very nice "From:" header format showing the full name of the person who posted, "Via", and the name of the list. The older list always just says the name of the list in the "From:" header. Can't seem to find a way to change this behavior to match the first list. I've looked through the help files and Wiki and have come up empty. Thanks for your time. Robert Wertheimer