Every Door Direct Mail (EDDM) service from the USPS allows you to target local neighborhoods with postcard mailings at a discounted postal rate. The process allows you to blanket mail entire carrier routes in your local market.You choose postal routes within specific zip codes, based on household size and income. Any household within these targeted routes will receive your EDDM postcards. This process eliminates any need for a consumer list for mailing, which can save you money on postage.