Fake email - a partial solution?

[Peter Taylor <Peter . Taylor @ newcastle . ac . uk>]

Hello,

Do any list managers have any comments to the question:

 "Why do dialup internet service providers allow outbound internet access 
  through port 25?" 

Much of the fake email that I see these days comes from dial-up accounts
and is usually passed through an intermediate relay in the hope of hiding
its tracks. If ISPs forced their dialup users to use their proxy SMTP
server(s), by banning connections to port 25 outside of their domain, there
would be fewer routes open to the email forger. Identification of the 
source would also be easier. 

If any ISPs already do this I would be interested to hear their experiences. 

Thanks for any input,

Pete 

-- 
      Peter Taylor, Mailbase Postmaster, University Computing Service, 
         University of Newcastle, Newcastle upon Tyne, UK. NE1 7RU
         Tel: +44 191 222 8214 Email: Peter.Taylor@newcastle.ac.uk  
          PGP Key and Info @ http://www.mailbase.ac.uk/team/pete/