Name: allowallsubscribe
Type: SWITCH
Default-Value: 0
Last-Modified: 2.3.17

Allow subscription to nonexistent mailboxes.  This option is typically used
on backend servers in a Murder so that users can subscribe to mailboxes
that don't reside on their "home" server.  This option can also be used as
a workaround for IMAP clients which don't play well with nonexistent or
unselectable mailboxes (e.g., Microsoft Outlook).
