Why not just Stop Spam on the servers - period.
With all the Spam as well as security scare around emails and the need for an anti-virus software to protect from those Spam as well as worms, trojans, and viruses that spread thru email, why not simply add a simple XML based "RSS feed" like feature on top of the email server.
A user then simply selects their server as an RSS Feed Source that they subscribe to.
A sligthly modified "email client" with XML parser could then be built on top of an RSS Feed Reader / Aggregator that would stop emails and Spams from being downloaded and pushed down to clients like in POP3 but users will get only the email subject and headers like "news-feeds" so they could decide and select which ones they need to read (download from the server) and the rest can be nuked straight at the server ?
I think - once most spams can be stopped this way in their tracks on the servers - and end-users (many now-a-days PC Neophytes) stop helping in its propagation over the net - the tidal wave of spam can be greatly reduced and managed.
Sounds like quite a simple solution isn't it ? Can any one see anything wrong with this ?
- Syed Ahmad