Comment 1 for bug 196882

Instead of displaying a web URL, it'd be better to show the unsubscribing mail address (any message sent to that address will trigger the unsubscription process):

To unsubscribe: mailto:launchpad-users-ubsubscribe@...

On the other hand, I wouldn't move the options/unsubscribe section on the footer to the head (it's the usual place were Mailman aware users will look for it). Add a new section (keeping the one on the footer) or making a reference to the mail address I mentioned above should do, IMHO.