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> Privilege and Confidentiality Notice This email and any attachments to it are intended only for the party to whom they are addressed. They may contain privileged and/or confidential information. If you have received this transmission in error. please notify the sender immediately and delete any digital copies and destroy any paper copies. Thank you.