Understanding Postal

Then I found many catalogs, including several big names, that use the vertical style address orientation (parallel to the bound edge) on the bottom of the back cover (as held with the bound edge to the right). Those addresses will need to move to the top.

The Penalties
If your catalog doesn’t meet the new requirements on March 29, 2009, it could be disqualified for Standard mail rates. That means you’ll have to pay First Class single piece rates. Conceivably, if you meet the address placement requirements but not the font and spacing, it could be mailed at Standard mail rates without the automation rate discounts. But even that's a significant postage rate increase.