Is my e-mail address being used to send spam?

Hi All,

I am looking for some guidance.

I have started to receive this e-mail 3/4 times a day. It seems to be 
legitimate, from a postmaster, bouncing an e-mail I sent (always to the same 
user apparently). Of course I did not send any such e-mail.

In the From (I have xxxxxx ed it out in the message below) it is always the 
same e-mail address (like SIMPSONB@xxxxxxx, BSIMPSON@xxxxxxx).

Is someone using my e-mail address to send spam?
If so, is there anything I can do about it?

As always, all advise is greatly appreciated.

TIA

Paul Tuohy

----- Original Message ----- 
From: postmaster@xxxxxxxxxxxxx 
Sent: Thursday, June 10, 2004 8:51 AM
Subject: GWAVA Sender Notification (Attachment block)


 
A message sent by you was blocked by GWAVA - Content protection for Novell 
GroupWise. 

The message was blocked for the following reason(s): 

  a.. Attachment block 
The message contained the following information:

      Subject: New changes 
      From: tuohyp@xxxxxxxxxxxxx 
      Recipient(s): Axxxxxxxxx@xxxxxxxxxx, xxxxxxxxxA@xxxxxxxxxx
      [No Cc Addresses] 
      [No Bc Addresses]  


The following information details the events that prevented delivery of this 
message:

      Event Details 
      Attachment blocked
     One or more attachments within this message were blocked because of their 
file type.
      The following attachments were blocked:


        a.. Nervous_illnesses.exe