6-2 Keyline Information — Format

6-2.1 Each mailpiece must have a properly formatted keyline. The keyline must contain the following required information printed in 8-point type or larger from left to right with at least one space between data elements:

1. Consecutive identification numbers in ascending order and not reversed sequence within a tray or package.
2. Weight increment of the mailpiece. (Not applicable for Standard Mail.)
3. Two-letter abbreviations for the qualified rate category of the mailpiece listed in Table 6-2a or Table 6-2b.

Note: Mailpieces that qualify for more than one discount must show each rate category abbreviation separated by a slash in the keyline. For example, a Standard Mail piece that qualifies for the 5-digit automation rate and is entered at the destination SCF must have a keyline that includes both “AV” and “DS” separated by a slash (AV/DS).

4. Total postage paid (based on weight increment and rate category).
5. Codes for internal use. (Your codes may be printed to the right of the postage paid information. Leave at least two spaces between the postage paid and any internal code information.)

Rate Category Codes — First-Class Mail

Rate Category Codes — Standard Mail