How is IM™BC Uniqueness Managed for Full Service?
To meet the requirements for Full Service, the IM™BC’s uniqueness is determined by a combination of the MID and the tracking id (serial number) within a mail class. The 15-digit MID / tracking (serial number) combination must not be repeated in mailings of the same mail class within 45 calendar days of the mailing date. Mailpiece uniqueness is not enforced across mail classes, meaning a piece of First-Class Mail® and a piece of Standard Mail® could carry the same 15-digit MID/ Serial Number combination within the 45-day uniqueness period. However, two pieces of First-Class Mail® (for example) must not have the same 15-digit MID/ Serial Number combination if the pieces are to qualify for the Full Service option. It is important to utilize the values assigned by trackmymail.com for each IM™BC in order to comply with this requirement for uniqueness. Note: According to the USPS, the 15-digit MID / Serial Number combination used on a Basic automation option mailpiece (unique or otherwise wi
