Evidence for monitoring email?

From: manukau26 (manukau26_at_yahoo.com)
Date: 02/01/04 

Date: 31 Jan 2004 23:52:01 -0800

Hi,

I sent an email from my personal company email address, which was not
delivered by our mail server, and the mail with the full header was
returned to me. I then noticed a strange "Received:" entry in the
header, with the machine name of a colleague of mine (who has access
to all IT resources in the company).

Here are the relevant entries (with real data replaced with dummies)
from the mail header: 

---
Return-path: <...>
Received: from from <anti-virus-scan> by <mailserver.company.country>
with mail-ok (Exim <version no.> (Debian))
	id <message-ID>	for <<receiver@email.address>>; <timestamp>
Received: from <machinename-of-colleague.company.country> ([<IP
address>] helo=<name-of-my-own-machine>)
	by <mailserver.company.country> with esmtp (Exim <version no.>
(Debian))
	id <message-ID>	for <<receiver@email.address>>; <timestamp>
From: <my own name and email address at company>
<...>
---
Does this mean my email is being monitored by that colleague? Or could
there be other, "legitimate" reasons for such mail relaying?
Thanks for any help in advance.
manukau26

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