budgenator's Journal: Could a new Email client help fight spam?

I've been thinking about Email Clients and spam alot lately, spam has been very topical lately.
mostly I'm thinking that an Email client that
1. only down loads header on first connect
  a.checks the headers against known open-relays
  b. maintains a database of know "spam" IP addresses for simple statistical analysis
  c. makes sure that the FROM, REPLY-TO, and BOUNCE fields are the same as the originating domain.
  d. do some baysian filtering
2. maintains a whitelist of friends and business associates for priority handling
3. alows the mesage to be deleted from the pop server without downloading the body of the Email
4. de-CGIifes the image tags
5. randomly bounces a few questionables and request a resend to confirm its from a human being.

stopping a few spams that sneak through the existing systems would realy give the spammers fits because the get such a pathetic response on their campaines.
  it shouldn't be to hard to do, just cut and paste from some open-source projects could get a prototype up for testing pretty quick.