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
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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