Hi All

I have just upgraded my client to 8.0.1 HP1.
Now when they send emails to some domains they get dsn responses as emails

I have disabled the DSN in the ESMTP tab, but they still receive the

The message looks like
The original message was received Mon, 03 May 2010 14:59:30 +1100
from Pegasus.Technology@btequipment.com.au.

----- The following address has been delivered -----
<mcasey@pegasustech.com.au>; originally to <mcasey@pegasustech.com.au>

************************************************** *******************
This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
the system manager.

This footnote also confirms that this email message has been scanned
for the presence of computer viruses.

Website - http://www.tuttbryantgroup.com.au
************************************************** *******************

The attachment contains

Original-Envelope-Id: groupwise.4BDE4913.DA5
Reporting-MTA: dns; pegasustech.com.au
Arrival-Date: Mon, 03 May 2010 14:59:30 +1100
Original-recipient: mcasey@pegasustech.com.au
Final-recipient: mcasey@pegasustech.com.au
Action: delivered
Status: 2.0.0

Any idea what is going on ?

Thanks in Advance
Mark Casey