METROCAST BLOCKS RESIDENTIAL E-MAIL

[aluminumsulfate at earthlink.net]

   From: Jason Stephenson <jason at sigio.com>
   Date: Tue, 14 Mar 2006 20:00:00 -0500

   > it that even they don't get accepted.  In the meantime any 
   > countermeasure is a hack.

   They're actually not ways to reduce spam. There are many, many analyses 
   available on the web that show exactly how these two systems are not 

Just off the top of my head...

 * Mandating SMTP AUTH
 * Universal use of GnuPG + message signing
 * HashCash (or similar systems) http://www.hashcash.org/

In general, any spam-proof messaging system will follow these rules:

 (1) By default, do not accept any messages
 (2) Accept messages from authentic senders
 (3) Retract sender authority if/when it's used to send spam

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