VERIFIED SOLUTION i

Do I use IMb or IMpb for a Bound printed Matter presort (and some other types of mail, such as Priority Mail)

The IMb option allows for mail pieces to be eligible for automation prices, mailings of lettersize and flat-size mailpieces will need to have an Intelligent Mail barcode on the mailpieces. The Intelligent Mail barcode (IMb) applies to the following mail classes and processing categories:  First-Class Mail letters and flats,  Standard Mail letters and flats, Periodicals letters and flats, Bound Printed Matter flats and Qualified Business Reply Mail and Permit Reply Mail.

The IMpb option applies to mail pieces in the following mail classes and processing categories: 
All parcels entered through the USPS commercial channels, including, but not limited to:
Priority Mail Express, Priority Mail, First-Class Package Services [First-Class Mail Flats not including], 
Parcel Select, Parcel Select Lightweight.
UPDATED:  August 30, 2017