eli5: when unsubscribing from an email list, how does the company know which email you are subscribing from?
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One thing to point out here is that most companies don’t do their own email marketing. They outsource it to external companies. And as pointed out, those companies will autogenerate an Unsubscribe link for every mailing list email — this is required by law in the US. You _must_ have a one-click unsubscribe, so it can’t ask you to login to do it, and they don’t want people to just enter any ol’ email to unsubscribe.
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