You might see a few, IMHO misguided, people implementing sender pre-authentication systems. A very few high-profile people might actually have justpficiation for a system that passes some senders to them and everyone else via their helpers for dealing with fan mail.
Wide-scale deployment of sender pre-authentication would require a significant number of system administrators to deploy such solutions and I do not think this is going to happen. I am fairly sure almost no system administrators support sender pre-authentication. As a system administrator I need to recieve mail from too many random people. The same goes for my boss, sales people, etc. If your business depends on email working, which is increasingly common, sender pre-authenticated is not an option. What I think we will see is widespread deployment of at least one system to authenticate sender's identities at least partially. SPF is relatively easy to deploy and sendmail is likely to support yahoo's proposed domain signatures soon. Neither will prevent spam, but both should make it more expensive[*], possibly by enough to make much of the current spam unprofitable. [*] IF you can not forge domain names then you might need to pay for a new domain name every few spams. This would eat into your profits (it be easy for registats to identifuy abusers and not grant them new domain names). -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
