For my first 4 years with E-mail I was only on DECNET/HEPNET.
So DECNET style E-mail addresses for me (TDS222 at IOWA
and TSHOPPA at FNALF).
Later on, some of my BITNET E-mail addresses from
the 80's and early 90's are found when I google
myself. Some of these were on the same VAXes
via BITNET gateways, others were on
PRIMOS machines on BITNET, a couple were
genuinely on IBM hardware and then later
Amdahl hardware. I really struggled with
the IBM user interfaces :-).
I did use UUCP forwarding on several occasions
but I never thought of the bang-path
as "my E-mail address".
Amazingly enough several of the
LISTSERV's that I subscribed to/posted to
back in the 80's still exist today in one form
or another. Some were surprisingly hard
to find but they're still there.