Please, makers of email subscribe and unsubscribe systems, stop allowing just anyone to supply any email address. That’s just asking for abuse. Stop putting your trust in random anonymous strangers.
What you should do when having someone subscribe: send a confirmation email to their address, with an expiring link.
What you should to when having someone unsubscribe: put an unsubscribe link into their email with a unique identifier that finds their subscription and instantly unsubscribes.
Nay-sayers to instant-unsubscribe links in emails tend to defend bad practices by email clients that will read the link before the user activates it. Email clients do that in an attempt to precache the linked page, to make it show up faster when the user does activate the link. Of course by that time the unsubscribe action already happened.
The correct course of action is to use a better email client, that won’t act that badly.
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