Hmm. At first blush
doesn't feel like it should be a #hashtag thing, but
maybe a firstname.lastname@example.org thing. Hashtags are more for
archive organization and muting.
Anyone else have any thoughts on subgroups?
Well, the owners and moderators of a group are a natural example of a
sub-group; one partially supported via the
address. The usual reason that Yahoo Group
moderators create a separate group for the mods/owners is to keep an
archive of the messages, and possibly files and other resources, which
isn't available via the +owner email forwarding.
Another take on that idea would be to make the groupname+subgroup
addresses (including +owner) fully instantiated groups, but with lowered
(different) join ceremony. Specifically the +owner subgroup would come
into existence automatically, and members promoted to moderator or owner
role could be joined to it by virtue of that promotion.
Other subgroups could be created ad-hoc by a moderator (with that
privilege) or an owner, and the moderator/owner would be able to
selectively add members to the subgroup without the overhead of
invitation. I don't think it should be possible to join the subgroup(s)
without being a member of the root group. It could be an option in each
subgroup whether members can see the existence of the subgroup; and
joining could be controlled by an option with the usual three choices
(any root member can join, any root member can request membership,
membership by anointment only).
Hmm... there's a namespace collision problem with +subscribe,
+unsubscribe or any future email commands. There are probably other
problems, I haven't thought this through for longer than it took to type