3 Basics
3-1 Minimum Requirements for All Mail
3-2 Dimensions for Letter–Size Mail and Flat–Size Mail
3-2.1 Letter–Size Mail
3-2.2 Flat–Size Mail (Enhanced Carrier Route Saturation Mailings)
3-3 Mailpiece Design
3-3.1 Size
3-3.2 Address Format
3-3.3 Price Markings
3-3.4 Use of In–Home Dates
