First off, unsubscribing to something that you did not subscribe to is a bad idea. Spammers are not interested in your preferences to receive their junk or not. They do appreciate you responding to their junk to know they have an active email address. Second, Thunderbird has no control over what makes it into the Inbox on your email providers server. Contact your provider to see if they have any kind of spam filtering that you can activate for your account. Thunderbird does have junk controls that you can use but that does not work until it gets the messages from your providers server and then you have to train the system by marking messages as junk. Learn about that here. http://kb.mozillazine.org/Junk_Mail_Controls