And since the individuals who need some services like this are not aware of the existence of these providers, the service provider takes the first mailing list step of seeking potential clients. These are done through email sent to the individual on the list or through the normal mail services. The quality of these lists varies as to the potential of getting mailing list a high return or possible clients actually purchasing the services offered. You can find a lot of direct mailing services where these lists are readily available. But it is a buyer beware scenario. You will almost always get what you pay for so to speak. Purchasing a mailing list does not always guarantee that those possible clients will buy from the services offered. This is more often use as a head start on mailing list building a new client base rather than expecting huge returns on investment quickly. A good mailing list is something that has the demographic match with your target customer and with a history of purchasing in response to direct marketing. An excellent mailing list acquired from bankruptcy mailing list can be critical and important for credit and debt counseling agencies. The definition of a mailing list in short: A mailing list is a list of names and email addresses that you can use to send out emails to. Mailing Lists are a great mailing list means of connecting with your customers or finding potential ones. Choosing the right mailing list is very important.