f. Sender pretends to be 300 other people and sends you buckets of spam.
Sorry, that was supposed to be:
f. Sender pretends to be 30,000 other people and sends you buckets of spam.
Now, if you like, add greylisting for unknown senders, so that those
300 msgs won't be accepted on the first try. Then, add a distributed
blacklist which you check your mailqueue against before delivery to
users' inboxes. Application of the blacklist can be part of whatever
other content spam filters the user has.
DCC already does that. It works reasonably well, with no need to
invent new consent protocols.
Regards,
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
http://www.taugh.com
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