Stephan, there are many, many tools available for blocking spam. Postini & GFI are among them, but there's lots of choices. BrightMail is good, as is MessageLabs, MXLogic, etc. You said you wanted to do everything right with the configuration of Exchange first though. Unfortunately, Exchange 2000 is a lot more limited in that regard than Exchange 2003 is. If you migrate to Exchange 2003, you can run Microsoft's free IMF tool, and you can set the SMTP process to query RBL lists. If you have to stay on Exchange 2000, I'd recommend you look at 3rd party solutions; if you are migrating to Ex2003 the Microsoft tools may be of interest. cw -----Original Message----- From: Stephan Barr [mailto:bdtsb@xxxxxxxxxxxxxxxx] Sent: Tuesday, December 07, 2004 1:36 PM To: [ExchangeList] Subject: [exchangelist] AntiSpam measures to be taken via Exchange configuration http://www.MSExchange.org/ Server Details: Exchange 2000 Version 6 Build 6249:4 SP3; Symantec Mail Security Version: 126.96.36.1993 on Windows 2000 AS Version 5.00.2195 SP4. Objective: To do everything I can to reduce the amount of spam received. I'm looking at Postini and GFI tools but want to do everything right with the configuration of Exchange first. Any help is appreciated.