doc/stanza_routing.txt

   1 No 'to' attribute:
   2         IQ:                     Pass to appropriate handler
   3         Presence:               Broadcast to contacts
   4                                 - if initial presence, also send out presence probes
   5                                         - if probe would be to local user, generate presence stanza for them
   6         Message:                Route as if it is addressed to the bare JID of the sender
   7
   8 To a local host:
   9         IQ:                     Pass to appropriate handler
  10         Presence:               -
  11         Message:                Deliver to admin?
  12
  13 To local contact:
  14         Bare JID:
  15                 IQ:             Pass to appropriate handler
  16                 Presence:       Broadcast to all resources
  17                 Message:        Route to 'best' resource
  18         Full JID:
  19                 IQ:             Send to resource
  20                 Presence:       Send to resource
  21                 Message:        Send to resource
  22         Full JID but resource not connected:
  23                 IQ:             Return service-unavailable
  24                 Message:        Handle same as if to bare JID
  25                 Presence:       Drop (unless type=subscribe[ed])
  26
  27 To remote contact:
  28         Initiate s2s connection if necessary
  29         Send stanza across
  30