A mailing list of renters is a difficult list to maintain than a new homeowner list simply because there is less demand for such an audience and renters by nature are more transient a population.  Since the renter population relocates more frequently than the new homeowner list population, the renter list is usually less accurate.  To increase the accuracy of a renter list, a good list broker will typically first create a suppression file of homeowners and new homeowner lists.  Then pulling a...