I wish to unsubscribe from the "Internet Marketing DIRT" magazine, but the unsubscribe email address keep bouncing back :

Your message did not reach some or all of the intended recipients.
Subject: Unsubscribe
Sent: 2008/11/22 09:56 AM
The following recipient(s) cannot be reached:
'[email protected]' on 2008/11/22 09:56 AM

They claim that you can unsubscribe ANYTIME.