International Bulk Mail

A cost-effective way to send large numbers of letters and documents internationally by International Air with a delivery target of three to 10 working days.

International Bulk Mail is available to New Zealand Post Account customers who post large amounts of mail at the same time - it offers greater flexibility with weight and size limits and can cut back administrative time and costs.

Key benefits

  • Flexibility: Each letter has a maximum allowable weight of 500g. Oversized printed material and parcels have a maximum allowable weight of 1kg.
  • Easy to use: Only sort by International Bulk Mail destination zone.
  • Items based on actual weight: Prices are based on the weight and destination of your items. You only pay for what you send, up to the next 10g increment for each item.
  • Zero-rated GST: This saves you administrative time in reclaiming GST and improving cashflow.*

*The cost of domestic air freight, if requested, will attract GST.

What can I send?

  • Letters up to 500g per letter.
  • Oversized printed matter up to 1kg per item.

Letters and oversized printed material items for each lodgement must be identical. Identical items may contain multiple copies of the same publication/contents, e.g. magazines, where some recipients want two or more copies in an envelope (up to a maximum of four different weights) or where the contacts are identical e.g. a statement and/or invoice in the same envelope.


The minimum lodgement quantity is either:

  • 400 identical letters per lodgement, or;
  • 400 identical oversized printed material items with a maximum weight per item of 1kg

Sending letters

  • Ensure your lodgement has a minimum of 400 identical letters
  • Check that each letter weighs no more than 500g
  • Ensure that each letter is properly labelled with a PermitPost impression or a pre-printed PermitPost impression
  • Attach an International Air Indicator Sticker to each letter or pre-print with an 'International Air' indicia
  • Complete a Statement of Posting form (AR019N) fully and accurately
Product information for sending letters
Size Max dimensions (height x length)
per letter
Max weight per letter Max thickness per letter Min volume per lodgement
Medium 130mm x 235mm 500g 20mm 400
identical items
Larger than Medium 260mm x 385mm 500g 20mm 400
identical items

Note: As some overseas sourced envelopes are 240mm long, we will accept this length as a Medium letter for Bulk Mail lodgements.

Sending oversized printed material

  • Ensure your lodgement has a minimum of 400 identical items.
  • Check that each oversized printed material item weighs no more than 1kg.
  • Ensure that each item is properly labelled with a PermitPost impression and attach an International Air Indicator Sticker.
  • Ensure the words "printed matter" are clearly recorded on each item.
  • Complete a Statement of Posting form including accurate quantities and weights.
Product information for sending oversized printed material items
Max length + width + depth
per item
Max length of any side
per item
Max weight per item Max value per item Min volume per lodgement
900mm 600mm 1kg NZ$250 400
identical items

Our additional compensation cover is not available for items posted using the International Bulk Mail service.

Contact your NZPost Account Manager today to see if you qualify for International Bulk Mail savings or National Contact Centre.