John Levine <johnl(_at_)taugh(_dot_)com> wrote:
If a spammer wants to confirm receipt, which very few of them do, he
uses web bugs. I suppose info about the MUA might be marginally
useful, but if I were a spammer and knew that a recipient was
sufficiently annoyed to press the spam button, I'd take them off the
list. I still have millions of other people to mail to, after all.
But I'd also sell his email address as a "known to exist, known to
look at spam" one :-(
Seth
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