Removed some outdated cruft from the SMTP queue handler:

Removed some outdated cruft from the SMTP queue handler:
* In the per-session data structures, CC->SMTP_RECPS and CC->SMTP_ROOMS
  are not used for anything, so they have been deleted
* Removed all recipient types other than remote because they
  aren't used -- non-SMTP recipients don
  don't go through this queue.