If I mark as SPAM, don't offer Unsubscribe Option
If I go to mark an email as SPAM, I don't want to unsubscribe from it. I think you have misinterpreted what others have asked for when they want to unsubscribe from an email in their SPAM folder that they know is not SPAM.
I know this is SPAM, and honestly, I think unsubscribing from it will just inform the SPAMMER that mine is an active email address. Just move it to the SPAM folder and block it in the future!
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Steve Heider commented
Offering to unsubscribe me with I mark an email as spam. If I subscribed to a it I know how to unsubscribe. I only mark it spam if I NEVER requested it. The only result when you send an unsubscribe request is to tell them it is a valid email resulting in more unwanted email.