Depending on the frequency of new valid-to-post subscribers e.g., if a
small number subscribe who are also allowed to post, THEN
* DEFAULT-OPTION= NOPOST
and occasionally list-owner issues
QUIET SET listname POST FOR *@someinternetaddress.com
QUIET SET listname POST FOR *@*.someinternetaddress.com
or if really low frequency:
QUIET SET listname POST FOR [log in to unmask]