And the answer is your own list. Yes we have access to all kinds of list, with just about any demographic that you can imagine but the person on your own mailing list has knowledge of your company or organization. Also the list must be cleaned up for undeliverable addresses and duplicates. The good news is that at Burns Mailing & Printing, Inc. we do this FREE for our customers and we send you back the ones that will not mail so that you can clean up your in house list. We run a NCOAlink update on everything that we mail and if someone has moved and is still in the USPS national change of address database we can, in most cases, give you the new address. It is important that you make those changes in your in house database because after several months those forwarding addresses will expire and we will then have no way of getting the new address.