You only unsubscribe from legit senders, never click on a true spam unsubscribe link.
If it's a regular email that you vindicatively want to classify as spam, do that and don't unsubscribe. It will go directly to your spam folder in the future, and it will hurt a tiny bit their standing with Google.
If it's a regular email that you vindicatively want to classify as spam, do that and don't unsubscribe. It will go directly to your spam folder in the future, and it will hurt a tiny bit their standing with Google.