12. Mailmark Letter Format specifications 12.1 Letter dimension requirements
Letter format Mailing Items must be rectangular (portrait or landscape) or square, and each Mailing Item must have four straight edges and four right- angled (90°) corners. The Letter dimension requirements are set out in the table below. These dimensions apply to the finished Mailing Item.
Format
Size
Weight
Thickness
Shape
Max 100gms
Max 5mm Min 0.25mm
Each corner to be 90°. Portrait, landscape or square
Rectangle: Max 165mm x 240mm Min 110mm x 140mm Square: Max 165mm x 165mm Min 140mm x 140mm
Letter
12.2.1 Sealing tolerances – Trayed Mail For DL and C5 sized Letters with rectangular or trapezium shaped opening flaps presented in trays only, there is a recommended tolerance of up to 35mm from the left and right edges and 35mm from the top edge where the flaps do not have to be gummed or sealed.
12.2 Flaps and sealing It is recommended that the opening flaps are gummed and sealed as far along the edge as possible and that the remaining three edges are fully and totally sealed. The sealing recommendations vary depending on whether the Mailing Items are presented in bags or trays.
Figure 5: Sealing tolerances – tray
12.2.2 Sealing tolerances – bagged mail For all other Letter Mailing Items there is a
recommended tolerance of up to 25mm from the right and left edges and 35mm from the top edge where the flaps do not have to be gummed or sealed.
Insert picture from page 12 of the RM guide
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