Getting messages non stop,of type: Microsoft Technical Assistance [qlrlipu_rczpk@news.com]

From: Henri Feinberg (hf_at_cedrom-sni.com)
Date: 10/02/03 

Date: Thu, 2 Oct 2003 10:22:23 -0400

Hi,

Maybe you can help us. We are getting about 20 messages each everyday with
viruses, here are example of these messages:

From: Microsoft Technical Assistance [qlrlipu_rczpk@news.com]
0/01/2003 07:52 PM The original attachment contains a virus or meets the
File-Blocking rules. ScanMail took action: INSTALLER83.exe/Moved, please see
your Exchange Server administrator for details!
******************************************
From: Microsoft Public Services [qbxruaosc_uvvk@technet.msn.net]
From: Microsoft Internet Security Section [omhedqtatm-kbrse@hozzl.msn.com]
From: Microsoft Corporation Network Security Section
[mrxklomc-agzigny@newsletters.com]
From: Microsoft Corporation Customer Support [gjzqrr@ypywja.msn.net]
etc. etc.

Any idea of how to stop these messages.

Thanks in advance,
Henri Feinberg.