Is anyone familiar with a product called Spam Lion. It's too pricey for my organization, but it seems to do the following:
Upon receipt of incoming email it checks to see if the sender is authorized. If the sender is authorized, the message is passed along to the intended reciepients. If the sender is not authorzied, the message is quarantined and the sender is notified by email and asked to perform a 1 time registration. Presumably the quarantine spool is automatically cleaned on a recurring basis.
That is called "challenge/response", and has many, many drawbacks. In short, you end up becoming a spammer, and your users end up losing a lot of mail.
Even if our customers convinced us that it would be a worthwhile action in Declude JunkMail, someone decided to buy a patent for it, so it would likely cost a large amount of money to take on such a test.
-Scott
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