Various "roles" can be defined, but perhaps not strictly enforced:
1) full-privs are handled by OWNERS=
2) don't receive mailto=listname-REQUEST@listhost via OWNERS=
QUIET:,rfc822_addr
2) receive notification of subscribes and unsubscribes is handled by NOTIFY=
3) errors and bounces ERRORS-TO=
4) editors of postings EDITOR= (and its optional companion MODERATOR=
5) authorized posters if not PUBLIC or PRIVATE: distribution option (SET)
NOPOST or EDITOR