This (mixed addressing, BITNET and Internet) is not just a domain names
problem.  Some sites, trying to move load from BITNET to Internet, on
reciept of a piece of BITNET traffic reply thru the Internet, with
Internet style addressing of course.   When you reply to that traffic,
your reply travels via Internet, showing a different from address than
the original sub request.  That is another problem.  In those cases, you
just need to either MAIL (not REPLY) your confirmation to the BITNET
address, or else start all over with an Internet sub request.
 
Dave Gomberg, role model for those who don't ask much in their fantasy lives.
GOMBERG@UCSFVM  Internet node UCSFVM.UCSF.EDU             fax-> (415)731-7797