Undeliverables

My network administrator is on vacation and I don't have a clue what is going 
on here.  If someone could tell me what to do, I would really appreciate it.

We're running Exchange 2000 on a Win2K server with Norton antivirus on the 
Exchange server, our file and printservers and on our workstations. We have a 
Cisco Pix firewall.

The Administrator's mailbox is filling up with undeliverables from "the System 
Administrator."  Are we a Sobig victim?  The undeliverables all have random 
subject lines and are addressed to random people.  Here's one of the 
undeliverables:

Your message did not reach some or all of the intended recipients.

      Subject:  beebe
      Sent:     8/27/03 12:08 PM

The following recipient(s) could not be reached:

      rejoice@xxxxxxxx on 8/27/03 1:21 PM
            There was a SMTP communication problem with the recipient's email 
server.  Please contact your system administrator.
            <pewclimate.org #5.5.0 smtp;550 <rejoice@xxxxxxxx>: inactive user>

What does this mean?

Thanks.

Jan MtPleasant

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