Unsubscribing is not possible from spam e-mails, because their links are disabled.
E-mails that go in the spam folder have their links disabled. To enable them one has to mark them as 'not spam' which will move them to the inbox folder. This includes the 'unsubscribe' button, which is often used to reduce spam e-mails. But no one would want to move their spam e-mails to inbox folder just to unsubscribe them. This is illogical and frustrating.
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Yash Agrawal
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