Size requirements

Each Lettermail™ item must meet our size and weight specifications.

There are two main categories of Lettermail that determine how much it will cost to send your item:

  • Standard Lettermail (50 g or less)
  • Other (Non-standard and Oversize) Lettermail (0 g to 500 g)

Minimum dimensions for all items are 140 mm x 90 mm x 0.18 m m (5.6 inches x 3.6 inches x 0.007 inches).

If your letter is larger than the maximum dimensions below, you must use our Parcel Services.

Standard Lettermail (50 g or less)

Use a single stamp for items that are in the standard weight and size range.

Minimum weight for:

  • Standard - 2 g

Maximum dimensions

  • 245 mm x 156 mm x 5 mm (9.6 inches x 6.1 inches x 0.2 inches)

Other (Non-standard and Oversize) Lettermail (0 g to 500 g)

Oversize or Non-standard size envelopes and postcards will cost you more (see Prices).

Minimum weight for:

  • Non-standard - 3 g
  • Oversize - 5 g

Maximum dimensions

  • 380 mm x 270 mm x 20 mm (14.9 inches x 10.6 inches x 0.8 inches)
  • Any item that exceeds the maximum size or weight of Non-standard and Oversize Lettermail no longer qualifies as Lettermail