Mailstream Plus IMpb printing question

Question: Why is the IMb data string produced by MailStream Plus product "print ready" data that can used by the print program, but the IMpb data string is not "print ready" for some printers?

Answer: With the IMpb data string there isn't just one standard encoding for IMpb, so MailStream Plus provides the IMpb string and the print vendor/user has to encode any additional necessary information for their specific print process.

UPDATED:  April 12, 2017