The NPL network, an experiment in packet-switching, used 768kbps lines Ray Tomlinson of BBN invents email program to send messages across a distributed network.
The original program was derived from two others: an intra-machine email program (SENDMSG) and an experimental file transfer program (CPYNET) (:amk:irh:) Project Gutenberg is started by Michael Hart with the purpose of making copyright-free works, including books, electronically available.
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Sure enough, after looking at the domain access logs, it was evident that many users were using the example domain in configuring their applications.