Target880 t1_jee962e wrote on March 31, 2023 at 11:45 AM

It is a legal requirement.

If you are a scammer there is another reason, If you us it they do know what mail address it it is from so they knew it is an account that is used and someone did read the mail and it did not just end up in a spam filter.

So they can validate that it is an account that is in use and it the address could be used for som phishing attack or just spam.

lodger238 t1_jefin4u wrote on March 31, 2023 at 5:11 PM

Sometimes it's even worse. Sometimes the unsubscribe button activates the malicious code in the email. You can check this with a hover, which will display the link.