If this is the case, then the second part of Scott's explanation doesn't make sense. Why didn't he just say, "Yes, once it's in someone's address book, then it's whitelisted for everyone on all the domains on that server". Also, this seems like a pretty good way to circumvent spam filters. Sign up to a service, get on their web mail, add to the address book, and spam away. I spose that's why you have the option of disabling it.
Comments?
You would think if spammers went through that type of trouble you would think that they would create graphic only spam to circumvent keywords with disposable domains for redirection, put together RFC compliant headers and send E-mail from open relays that were undiscovered by the various RBL's, yet very, very few do this type of thing. It's because these guys are lazy and dumb that 95%+ of their spam can get blocked by an administrator with less than $1,000 worth of software and a moderate degree of knowledge.
In other words, no one is going to track down the practices on your particular server unless possibly you host hundreds of thousands of addresses.
Matt
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