And How To Get Out ...
$ telnet/port=imap mail.opus1.com
Trying... Connected to MAIL.OPUS1.COM.
* OK cello.Opus1.COM IMAP4 Server PMDF5.1-2.2 at Wed, 25 Sep 1996 17:52:40 MST
login BAD Command unrecognized/login please: TRUMBO
a2 BAD Command unrecognized: QUIT
a2 BAD Command unrecognized: EXIT
a2 BAD Command unrecognized: CLOSE
* BYE Cello.Opus1.COM [192.245.12.7] IMAP4 server terminating connection
Connection closed by Foreign Host