Fucking hell. We actually HAVE a "Allow non-subscribers to mail to

Fucking hell.  We actually HAVE a "Allow non-subscribers to mail to
this room" flag.  I was confused by the poor wording of this option
in the text client, and screwed up the server's behavior when I
rewrote the mailing list server.  It's fixed now, and once again
has the correct behavior: anyone can email a room when the flag is
set, and subscribers can email the room regardless of the flag.