Currently Being ModeratedDec 31, 2012 8:12 AM (in response to mschief)
The above solution will not work for all e-mails.
There is a tiny "unsubscribe" link at the bottom of each ad e-mail from iTunes.
The tiny link is buried in a huge list of links, so put your magnifying glasses on to find it.
Link will take you to a management page where you can turn off the e-mail announcements.
Hope this helps.