This is a good feature but the issue is that even if you unsubscribe from a mailing list some will not actually unsubscribe you. Also i found out a while back

This is a good feature but the issue is that even if you unsubscribe from a mailing list some will not actually unsubscribe you. Also i found out a while back that after unsubscribing from some lists i started getting a lot of spam from all kinds of lists to which i never subscribed before which let me to believe that some mailing lists will actually release/sell their unsubscribed lists to others. Btw this was tested on brand new email accounts with only one mailing list subscribed at the time.