With the USPS reporting over 25% of direct mail is undeliverable as addressed-junk mail abounds. Response rates have gone from 2+% a decade ago to less than 1%. Your undeliverable and miss-delivered mail will be greatly reduced if you obtain only current-month data from the most accurate sources and utilize the appropriate postal and demographic selects.
The differences in list selects from various sources are staggering. Nothing could be more “green” than mailing only to the appropriate prospects. Please see, “How to buy a list” for some free advice on obtaining the most accurate and appropriate lists.