Unsolicited credit card offers are an identity theft risk as thieves can take the materials out of your mailbox and open credit cards in your name without your knowledge. With ID Preserve, you can request to opt-out of receiving "firm offers" for five years or permanently.
Sign into the Members Area, access the "Personal Information Center" and go to the "My Plan" page. From there you can follow the link to be removed from pre-approved credit card lists.