While looking up a chip, I found a USENET posting with a typical .signature UUCP bang path from "well known backbone site" ARPA has "at-hack" to forward to CSNET via the relay/gateway UUCP: ...!cbosgd!osu-cis!bgsuvax!kemp CSNET: kemp at andy.bgsu.edu ARPA : kemp%andy.bgsu.edu at relay.cs.net