>They are doing what's required by law...providing a way to opt-out. Your other option is to filter the email on your end.
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>>I don't want to enter my email address in to a subscription management form. I want to know where they got my email address in the first place...
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I get so many bogus emails everyday, it's not even worth the time to do the "opt out". Of course, most of them don't really work, they just put that on the page. I just delete the 100 or so I get daily. I'd really like to torture the people that send it though!