eli5: when unsubscribing from an email list, how does the company know which email you are subscribing from?
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Depends how you are unsubscribing.
If you are unsubscribing from your email, the link will either
1) unsubscribe you directly from clicking the email by sending a message to their server that basically says, Unsubscribe <Insert your email here> from emails
2) The link takes you to a page that one way or another saves your email (usually this is done in the background of your client) then when you click unsubscribe, it sends the same message as 1.
Tldr, the company’s server needs two things, your email and the message, unsubscribe
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