You can prepare this mail by sorting the data into a postcode numbered sort and stacking the mail on a pallet or in a box in the postcode order. The minimum requirement would be for an ascending/descending postcode order sequence.

Item definitions

P – small/letter (P for French word petit)
any piece that has

a length of less than or equal to 245mm a width of less than or equal to 165mm
a thickness of less than or equal to 5mm a weight less than or equal to 100grms

G – large/flat (G for French word Grand)
any piece that has

a length of greater than 245mm and less than or equal to 381mm
a thickness of less than or equal to 20mm
a width of greater than 165mm and less than or equal to 305mm
a weight less than or equal to 500gms

E – packet (E for French word encombrant)
exceeds any of the four limits of LARGE/FLAT
is a book of pamphlet with a weight less than or equal to 5000grms
has a weight of less than or equal to 2000grms

Undeliverable Mail
Any undeliverable mail is sorted daily and delivered back to you.