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I have had a problem where people sign up for stuff using my email address. Yes I can (and do) unsubscribe, but it is really nice that these are now pretty much all filtered out of my inbox automatically.

I've never seen a marketer verify email to make sure it was actually the requester who owns the email like other web services do.

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Almost all the big email marketing software sends you an email after sign up to verify you want to receive emails from them. It's called "double opt-in".

Key word: "almost".

I've got a large and growing procmail list of complete idiots (yep, shell mail on a private box).

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