Stopping open proxies and open relays

Force all SMTP outbound connections from users thru a SMTP proxy. On that
proxy, force users to do SMTP Authentication; I've heard only once of a


code that will use the user's configuration info or dispatch e-mail thru
them. Even if they do, you can rate-limit messages/hour, unique mail
to/hour, disable mail service after a threshold, whatever sounds a good
policy to you.

This is the most sensible message I've read about SPAM in
a long time. And it is even highly relevant to network
operators who service end users. Now if only we could
come up with something similar for ISP server-to-server
mail transfers then we might actually reduce SPAM to
a dull roar receding into the distance.

--Michael Dillon