CiviMail and unsubscribing from smart group
It looks like your smarties aren't being replaced when the message is being sent.  The link should have a url to your civi something along this line:

http://www.yourcivi/civicrm/mailing/unsubscribe?reset=1&amp;jid=516&amp;qid=102338&amp;h=b0636ed456c5e1f5.  

(That is assuming the link you reported is from an actual message that someone received and not what you have in the template or footer in civi.)

Do you have smarties enabled in your civicrm.settings.php file?

define( 'CIVICRM_MAIL_SMARTY', 1 );

See http://wiki.civicrm.org/confluence/display/CRMDOC/Smarty+in+mail+templates