Hi Tony

>>Can anyone tell me if it is possible for a network administrator to
>>have a copy be sent to himself of all mail messages being sent
>>from one indivdual on the mail server to another individual on
>>the mail server with out them knowing?

Absolutely. It is in fact very easy. It has been possible since
the earliest days of SMTP.

But you're looking at things the wrong way, in my opinion. I too
have been in the situation you are in, where someone was reading my
mail (actually, they were reading my outgoing mail regardless of who
I sent it to). At first, when I found out (a comment was dropped that
made it clear the person is question had read an email, because the
information had *only* been sent in the email), I was angry. But
then I saw there was an upside.

I switched to using hotmail to send emails (a *good* admin could
get traces of the form parameters of all requests sent to hotmail,
but there are few that good!)... but continued to use the mail system
that had been compromised (though I was very careful what I said,
and told people off-line or via hotmail that when responding to my
work email they should also be very circumspect). I even considered
using the work email for disinformation (e.g. set up an "imaginary
friend" account on hotmail for myself, and send emails to it, and
from it, but decided against it -- too much effort).

I never for a moment considered confronting anyone over the
monitoring of my emails, because that would have been a way to:
(a) let them know that I knew;
(b) escalate the situation further.

Don't get mad. Don't try to get even. Get sneaky.
Hope this helps.
Seeya,
James