List Hygiene — ABCs of Improving Address Quality

About the Author
Dave Lewis is the president of ProList, a Maryland-based direct mail firm. He is also president of trackmymail.com, a Web-based mail tracking company. Lewis can be reached by e-mailing dlewis@trackmymail.com or by calling (888) 444-9972.

Resource Links

USPS ZIP+4: http://www.usps.com/ncsc/ziplookup/vendorslicensees.htm