Re: What changes would you make to stop spam? - United Nations Paper

[Kenneth Porter]

It occurred to me that it would be nice to have a dynamic IP whitelist, 
such that clueful users could connect via secure DNS update and register as 
having a clueful MTA on their LAN that sends clean direct-to-MX. If such a 
whitelist existed, I would be a lot more comfortable using a DUL blacklist.

(BTW, do any ISP's include a no-direct-MX clause in their ToS? I know that 
most specify no servers (again, Speakeasy being the clueful exception), but 
direct-to-MX is not a server.)