The message
from Jane Ransom contains these words:

Unfortunately, you never know, when you make up an email address,
whether or not there actually is some poor person with that address in
which case they will get all the spam directed at you!!!!!!

The would-be user could try a websearch, or emailing it, to find out
if it belongs to someone else.

Hijacking someone else's legitimate email address to use on usenet,
will be revealed to the owner the first time someone else on a newsgroup
sends a private reply to it. It's a fast and guaranteed way for the
hijacker to get dumped by their own isp.

Janet.