Exchange: Using XBL block list to filter incoming email.

Spam spam spam.. Let's block them using XBL black list.
Exploits Block List (XBL) is a database which has been frequently updated for any known spam mail sender. You can configure your Exchange server on its Connection Filter to use any or multiple XBL lists to filter spam messages.

Open Exchange System Manager,  First Organization, right click Message Delivery, left click on Connection Filter tab.then enter any known XBL FQDN

 

For more information regarding XBL block list, please check out in Wiki:

http://en.wikipedia.org/wiki/The_Spamhaus_Project