Strange delivery notes involving syntax?!

Hi all,
        I've started getting this error on some accounts recently and
can't really work out what's causing it. Any ideas?

Error Message:

From: postmaster@xxxxxxxxxxxxxxx
Sent: 26 July 2004 17:33
To: Weston, Andrew SRW
Subject: Delivery failure (a.b@xxxxxxxxxx)


Your message has encountered delivery problems to the following
recipient(s):

a.b@xxxxxxxxxx
Delivery failed
500 Syntax error, command unrecognized


Sent:    BDAT 6806 LAST
Received:500 Syntax error, command unrecognized
 

We had a "contractor" working on our routing groups earlier this month
but I'm still trying to find out what he did as I was away. Could this
be the cause?

Win2k server running Exch2k.

Thanks!

Regards 
Tim Sutton 
IT Systems Manager

Troup Bywaters & Anders
Eastgate House
10 Eastgate
LEEDS LS2 7JL  
Tel: 01132432241 
Fax: 01132424024 
E-mail: t.sutton@xxxxxxxxxx <mailto:t.sutton@xxxxxxxxxx> 

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