A notable example of 'opt-out' that comes to mind is not in the world
of email, but the 'do not call' list used for telephony.
True. The do-not-spam list is one of those ideas that keeps
coming around. Phones and e-mail are not really comparable here
because there is a fixed well-known set of phone numbers, while
there isn't a fixed set of e-mail addresses. I can easily list all
the numbers I don't want people to call, but I can only describe the
set of email addresses not to spam by using pattern matching.
R's,
John
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