Express Post letters

Image of postie delivery express post letter on motorbike

For next business day delivery* within Australia, use our handy Express Post prepaid envelopes.

Express Post is your best option for urgent mail. Next business day delivery is available between all capital cities (except Darwin), and selected major towns.

Check our Express Post network for a full list of delivery locations. If your destination isn't listed, it means your item may not get there the next business day - but we'll still get it there as fast as we can.

Express Post prepaid envelope prices

Letter type** Max. size Price

Small DL (window face)

110 x 220mm


(1-9 packs)
(10+ packs)
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Medium C5

162 x 229mm


(1-9 packs)
(10+ packs)
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Large B4

250 x 353mm


(1-9 packs)
(10+ packs)
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Maximum weight: 500g
Maximum thickness: 20mm

Buy Express Post envelopes

Small (DL)

From $59.50 (10 pack)

Medium (C5)

From $61.95 (10 pack)

Large (B4)

From $74.10 (10 pack)

Posting your letter

Post your Express Post envelope Monday to Friday in one of the following ways:

  • Over the counter by 5pm (earlier in some provincial and suburban Post Offices) 
  • in a yellow street-posting box by 6pm (earlier for some Perth suburbs and provincial cities)

Frequently Asked Questions

* Next business day delivery is only available within the Express Post next business day delivery network. For more information visit The national next business day delivery network operates between capital cities (excluding Darwin; and for Perth between CBDs only) and some major centres.

** Rigid or inflexible items such keys, pens, USBs or CDs should never be sent in a regular paper envelope as they could easily be damaged by our sorting equipment or torn from the envelope and lost. Items like these should always be packaged correctly and sent as a parcel. View our packaging hints and tips and domestic parcels.

Need letters delivered fast?

Choose from our range of prepaid Express Post envelopes.

Buy now