Mail Processing and Distribution
What candidates must know
This domain covers how mail moves from collection through sorting to delivery. Key concepts: the distinction between collection, processing (culling, facing, canceling, sorting), transportation, and delivery; the role of processing facilities and distribution centers; the difference between machinable and nonmachinable mail; how mail classes and shapes (letters, flats, parcels) affect handling; and the concept of sortation levels that determine how finely mail is sequenced before it reaches the carrier. Candidates should understand that barcodes and address data drive automated sorting, and that mail is worked in sequence to reach the carrier in delivery order.
Traps in questions
Questions often blur the line between processing and delivery, or imply that all mail is sorted identically. Remember that nonmachinable items require manual handling and may move more slowly. Another trap: confusing a processing facility with a retail unit or a delivery unit. Also be careful with sequencing - carrier route sequencing is the finest level and is not the same as a general distribution sort.
Rule of thumb
Follow the flow: collect → process/sort → transport → deliver. At each step, ask "what level of sort is this?" Finer sorts mean less work later and faster delivery.
Worked example
A letter with a complete, barcoded address moves through automated sorting to carrier route sequence, reaching the carrier in delivery order. A rigid, oddly shaped item that cannot be machined is culled for manual handling, adding time. Same destination, different path - driven by machinability and sortation level.