paper-net

n. Hackish way of referring to the postal service, analogizing it to a very
slow, low-reliability network. Usenet sig blocks 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.