N
Nigel Wade
You are right that some small mail server cannot do it. But if the major
players jointly agree to enforce something like that then people will have
no choice but to comply. And that is actually what is happening. AOL, MSN,
and Yahoo are joining forces to fight Spam and it will be something like was
described:
http://www.internetweek.com/breakingNews/showArticle.jhtml?articleID=9400061
Don't forget that there are thousands and thousands of mail servers out
there not run by any major ISP. Nearly every University and college in the
world have a mail server handling thousands of users, and most large
companies have their own mail servers.
The entire ethos of internal email is that it is co-operative, and runs
according to agreed protocols, not diktats from a small cartel.