Opt out of credit card mailings

My husband and I have adopted Dave Ramsey's Financial philosophy.  We avoid any credit card debt (been there, done that).  We still are inundated with credit card applications.  The companies apparently still think we are good victims.  I was just made aware of a website where you can sign up to "opt out" of these mailings.  The site is www.optoutprescreen.com.  I just signed up.  It is the official consumer credit reporting site where you can opt in or opt out of credit and insurance offers.  The mailings should stop in about 30 days.  I will let you know.  Last week my husband and I received at least 15 of these mailings.  My shredder gets a weekly workout!