Create a "black hole"
In Exchange 5.5 and up, you can block domains or users through Exchange Admin by opening Admin | Find Connections | Internet Mail Service | Connections | Message Filtering.
But a more sophisticated way to reject messages from people you don't want is to create a custom recipient (usually named "Banned") in the Internet Mail Connections | Delivery Restrictions list. Any time another mailer comes along to ban network-wide, simply add their SMTP address to the "Banned" e-mail addresses list (i.e., a single custom recipient with lots of e-mail addresses assigned to it). This "black hole" can be expanded indefinitely as you see fit.
Serdar Yegulalp is the editor of the
Windows 2000 Power Users Newsletter.
This was first published in December 2001