paper-net

paper-net n.  Hackish way of referring to the postal
   service, analogizing it to a very slow, low-reliability network.
   Usenet {sig block}s sometimes include a "Paper-Net:" header
   just before the sender's postal address; common variants of this
   are "Papernet" and "P-Net".  Note that the standard
   {netiquette} guidelines discourage this practice as a waste of
   bandwidth, since netters are quite unlikely to casually use postal
   addresses.  Compare {voice-net}, {snail-mail}, {P-mail}.