Telecom digest has been running since 1981. I don't know if any of the Amateur Press Associations (APAs) made the leap to digital, but an APA is fundamentally a digest email list done with a copier/mimeograph/hectograph and the postal service as the transport layer, and there's at least one active one that's 80 years old.
Paul Koning via cctalk <cctalk@classiccmp.org> writes: >> On Apr 21, 2017, at 1:26 AM, Pontus Pihlgren via cctalk >> <cctalk@classiccmp.org> wrote: >> >> Congratulations to us all, even if a little late. >> >> It makes me wonder, what is the oldest still running mailinglist? > > Don't know about *the* oldest, but one that's quite old and still very active > is the TZ mailing list (about timezone rules and their ongoing changes). > This is the list that collects and distributes the data that keeps clocks > worldwide showing the correct local time, at least when politicians give more > than a few days' notice of a change. > > The first message on that list is from Arthur Olson, Mon, 24 Nov 86 19:58:12 > EST. Though retired now he still occasionally contributes. > > paul