[Mailman-Users] corporate spam filter operation

[Rich Kulawiec]

On Fri, Mar 21, 2008 at 08:50:45PM -0400, Matt Morgan wrote:
> Are there corporate, enterprise spam-killing services that work on a
> user-by-user basis, rather than a message-by-message basis? For example,
> where the same message, sent to a few different people, might be rejected as
> spam for one recipient but not others?

Yes, there are.  There are also innumerable ways to handle this using
open-source software coupled with MTAs like sendmail, postfix, etc.

But (and I'll try to keep this very short since it's off-topic,
so contact me off-list to discuss) I consider it a major strategic
mistake to attempt this.  Per-user exceptions only benefit the enemy.
And under no circumstances should users be permitted to control them:
they're clearly incapable, as they've proven hundreds of millions of
times (if not more) and continue to prove all day every day.  See also
item #5 on Marcus Ranum's most excellent:

	The Six Dumbest Ideas in Computer Security
	http://www.ranum.com/security/computer_security/editorials/dumb/

---Rsk