EMACS dies

[Kulp at MIT-Multics]

When I telnet to Multics from a LISP machine and run EMACS, it asks me
what type of terminal I have.  I'm not sure what the right thing is or
what the LISP machine claims to support (it should support supdup_output
presumably) but when I answered the question by saying "supdup" it died
in LISP with a wrong type arg error.

Also, why does it not work to send mail to Liaison from EMACS but it
works using send_mail?  Is it a special crock in send_mail or something?