[tkinom]

Optionally via Carrier Pigeons or Owl Post for the few without internet access.

[fredley]

IP over Avian Carriers: https://www.ietf.org/rfc/rfc1149.txt

[TrevorJ]

As I recall, packet loss was the main issue, as the packet size was enormous.

[Piskvorrr]

Owls are way better at routing than IP, especially with roaming users ;)

[tkinom]

You mean there are non-wizard who also use Owl Post? :-)