We understand the difficulties involved in developing a good customer list--it requires dedication and perseverance. Taking short cuts and purchasing third party lists requires a significant amount of due diligence.
Below is a prime example of a third party list that got a client permanently suspended from our service. The client purchased a list from Data Depot. It was "Opt-in" according to the list broker and while it initially was able to get past our Compliance check, the end result was only 67% deliverable. To make matters worse it triggered an RBL listing, so the client even jeopardized their web site hosting service.
An organically grown list takes more time but the list members are worth that much more!