Large C4 Prepaid envelope withdrawal

From 1 July 2025 Large C4 prepaid envelope will no longer be available to buy from postal outlets or online.

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Letter deliveries have changed

From 15 April 2024, estimated delivery timeframes for regular and priority letters have changed. Please note, letters may be delivered earlier than the timeframes shown on our website as we make progressive delivery model changes across the country through to the end of 2025.

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Sending a letter within Australia

Letters sent within Australia can only contain flexible items no thicker than 5mm for small letters and no thicker than 20mm for large letters. If your letter is larger than our maximum size and weight, or contains rigid or inflexible material, it will be considered a parcel. 

Choose from 3 delivery speeds

Delivery times vary depending on the delivery speed you choose, the size of your letter, and where you’re sending from and where you’re sending to. 

Regular1

  • 3-5 business days same state
  • 4-7 business days interstate
  • Use a prepaid envelope or your own envelope with a stamp/s
  • Postage from $1.50
Regular letters

Priority1

  • Up to 3 business days same state
  • Up to 4 business days interstate
  • To send as Priority, affix one Priority label next to the postage stamp/s or on a prepaid envelope/s
  • Postage from $1.50 plus 70c for a Priority label
Priority letters

Delivery timetables for Regular, Priority and Express Post letters

Calculate the cost and time to send your item

Use our online calculator to estimate the postage price and delivery time to send your letter within Australia. Choose ‘Australia’ and enter the ‘from and to’ postcode, then choose ‘Letters’. If you need more assistance, visit your local Post office and talk to our friendly team.

Postage costs and delivery times

Send documents with tracking and proof of posting

Choose Domestic Letter with Tracking or Registered Post to get proof of posting and tracking. You must lodge your envelope over the counter at a Post Office for proof of posting.

Domestic letter with tracking

  • Get proof of posting (if lodged over the counter at a Post Office)
  • Tracking
  • Compensation up to $100 included for loss or damage
  • Add Extra Cover for up to $500
  • Choose from DLX, C5 and C4 prepaid envelopes
  • Add Priority label for Priority delivery
  • Buy in store or online 
Domestic letter with tracking Shop now

Registered Post

  • Get proof of posting (if lodged over the counter at a Post Office)
  • Tracking
  • Signature on Delivery
  • Compensation up to $100 included for loss or damage
  • Add Extra Cover for up to $5,000
  • Choose from DL and B4 prepaid envelopes or use your own envelope and add a Registered Post label
  • Buy in store or online
Registered Post Shop now

Letter size and weight guide to send within Australia

Check our guide to confirm if your item can be sent as a small letter/postcard, large letter, or seasonal greeting card including a Christmas card. If your letter is larger than our maximum size and weight, it will be considered a parcel. If you need assistance to weigh your letter, please visit your local Post Office.

Note, inflexible items such as keys, pens and USBs shouldn’t be sent in regular paper envelopes as they can get damaged in our sorting machines. These items must be sent as a parcel in a tough bag or padded bag.

Underpaid mail

When using red street posting boxes, you must apply the correct postage for your items. If we detect that your mail was posted with insufficient postage, we may invoice you the difference plus an admin fee.

Learn about underpaid mail

Information to help send your letter within Australia

Stamps

Get information on stamps including prices, concession, collectables, Christmas and personalised.

Learn more

Envelopes

View our choice of envelopes including prepaid envelopes and postcards, and plain envelopes in a range of sizes.

Learn more

Are you a business customer?

View our range of domestic business letter services, including low volume sending and bulk mail.

Domestic business letters
View more FAQs

1 While we will endeavour to meet this timetable, the actual delivery speed will depend on where in each state/territory the item is being posted from/to, and the level of restrictions and congestion in our delivery network at the relevant time.

2 Next business day delivery is only available within the Express Post next business day delivery network. The national next business day delivery network operates between capital cities (excluding Darwin; and for Perth, delivery into the CBD only) and some major centres. Express eParcel is not covered in the Express Post guarantee.

3 Track events will vary depending on how your item is lodged and delivered. For details visit our tracking service.

4 Express Post comes with up to $100 compensation included. Additional charges for Extra Cover apply. Extra Cover provides you with cover for the specified value of your item (up to $5,000 or part thereof) if your item is lost or damaged while being carried by Australia Post. Visit optional extras for more information. Subject to the Australian Consumer Law, Australia Post does not accept liability for any consequential or indirect loss or damage arising due to any failure related to our service. Neither the compensation included with our service nor the purchase of Extra Cover limits any rights you may have under the Australian Consumer Law.