If I remember right, it was/is Robert Armstrong who had that up and
running.
LEGATO used to relay email between HECnet (using MAIL11) and the
Internet/SMTP, but I quit doing that last fall when I switched registrars.
There's no reason I couldn't - I just never bothered to set up the necessary
domain name and mail routing again.
It was pretty much never used, even by me - after all, everyone with a
HECnet connection already has an Internet connection.
Bob