DNS and remove cancelled domain from record

[zillah]

At work (2003 Active Directory) , we have got two domains: LMSD.au,,,,and LMSD.net,,,,,,,,(fake domain).

LMSD.net was cancelled, What is the proper way to remove it from the DNS server ,,,,,because right now our mail firewall filter captured all the packets that destined to LMSD.net as spam.
Regards

What I am looking for is to remove the record from a server, not to remove the server from the DNS.

Note: Windows platform are 2003 server and XP clients

 

[Osiris]

http://support.microsoft.com/kb/216498