I always traced the boxes of formula samples I received. You can back-track from the shipping label. I was led to a mailing list company which was more than willing to tell me that they had purchased my information from Mothers Work. I contacted Mothers Work (which also owns Motherhood Maternity, Pea in the Pod, and a few others) corporate office and they freely admitted they sold all the identifiying into they got from their customers. They took my name off their list but that didn't stop the samples because of course they had already sold my information while I was pregnant. The person I talked to made it clear the company had no problem with their policy of selling customer info, even when I asked to file a complaint about the practice. As I recall, they didn't even have a procedure for filing a complaint. I never bought another item from any Mothers Work co again.