Exchange Filtering

Found this from a techrepublic mailing:

TURF'S UP!
Had it up to here with all that unsolicited e-mail (hoaxes, chain
letters, advertisements, etc.)? Then stop it in its tracks.

There are several ways to stop the influx of junk mail. Like the "Turf"
table, for instance. The Turf table contains a list of e-mail addresses
used to verify the From address on incoming Internet mail. While this
filtering tool doesn't boast the sophisticated features that some
third-party tools feature, it's a good place to start.

To enable the Turf table, modify the registry of the Exchange Server
that runs your Internet Mail Service (IMS).

1. Use REGEDT32.EXE and browse to the registry key HKEY_LOCAL_MACHINE\
System\CurrentControlSet\Services\MSExchangeIMC\Parameters.

2. Add a REG_MULTI_SZ value called TurfTable.

3. In the Multi-String Editor dialog box, enter the mask entries, one
per line, that identify the offending spammers. Use the following
format to generate mask entries:

* #@domain.com--stops all messages sent by domain.com
* @domain.com--stops all messages sent by domain.com and its subdomains
(subdomain1.domain.com, etc.)
* user@domain.com--stops all messages sent by user@domain.com

4. Stop and restart the IMS to begin discarding all messages flagged by
the Turf table's mask entries.

For more information on the Turf table, see the Microsoft Exchange
Server 5.5 Release Notes in the README.doc file (located in the root
directory of your Exchange Server 5.5 Installation CD-ROM).

NOTE: Remember, editing the registry is risky, so make sure you have a
good backup before you begin.

How 'bout Norton Antivirus for Exchange 2.x? It will block Hybris as well as any other known viruses. You can also set it to block specific file types from being sent to your network.

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