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Re: [ietf-smtp] Per-Recipient Data Responses

2014-03-17 23:35:44
OTOH: The assumption behind that conventional wisdom is that the unsubscribe acts as a active account validation and thus makes the address more valuable to spammers since they know that the address got accepted as opposed to possibly having bounced.

In this case the conventional wisdom is just wrong. Disregarding exotic stuff like spear phishing, all they care about is volume, not list quality. There is no evidence that spammers sell lists of unsub addresses.

The FTC did an actual experiment a few years ago, where they set up two groups of accounts, clicked all the unsub links in one group's spam, and then counted the subsequent mail. The unsub group got less spam.

John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
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