Effective March 4, 2013, the Postal Service™ will revise Mailing Standards of the United States Postal Service, International Mail Manual (IMM®) Exhibit 382.6 to illustrate an Intelligent Mail® barcode (IMb™) instead of a ZIP+4® POSTNET™ barcode. In addition, we will slightly revise section 382.61 to list the IMb first.
The unique Intelligent Mail® barcode (IMb™) or ZIP+4® POSTNET™ barcode preassigned by the U.S. Postal Service must appear on the address side of each IBRS mailpiece.***