🚀 go-pugleaf

>  I have configured sendmail
> so that BITNET addresses go to UREP, and all others go to TCP, which
> I assume is correct.

Not necessarily.  DOMAIN NAMES shows many domains marked
:interconnect.NO, meaning that BITNET hosts should send all mail via
BITNET to the designated gateway.  Those include domains that are not
really connected to the Internet at all (TCP/IP just dumps mail onto
CUNYVM, which then has to deliver via BITNET anyway).  Other domains
may simply prefer the BITNET delivery route because of speed, cost,
or local whim.  Using the Internet in these cases may or may not make
somebody unhappy, but it should work.  However, DOMAIN NAMES also
lists .UUCP, which is not a valid Internet domain name, and must be
handled carefully (e.g, sent via BITNET to the designated gateway).

>  Or is it the case that the
> responsibility to map BITNET node CONNCOLL to mvax.cc.conncoll.edu
> falls on the Internet user, using whois, etc...

One thing you can do is add the :internet tag to your node entry with
that mapping.  It serves to make LISTSERV's (among others) recognize
your Internet address as being the same person as your BITNET address.
                                  John