Understanding Postal: Web Exclusive - Stay Close to Postal ... Now More Than Ever

Meeting USPS Catalog Design Requirements
Another area where noncompliance with USPS requirements can have significant consequences is that of your catalog's physical design. Although the USPS delayed implementing some design changes for catalogs (such as the “droop” requirement, which now is scheduled to take effect in June), there are likely to be additional requirements implemented during 2010 that'll impact catalog designs.