Domestic business letters
We offer a range of business letter sending options, including lower prices for larger volumes.
Mailing business letters 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.
Small volume – under 300 letters
Choose from Regular or Priority delivery, Express Post letters, Registered Post and Domestic letter with tracking.
Large volume – 300+ letters
Send mail in bulk and you may be eligible for lower prices.
Postage costs and delivery times
View or download our business postage guides, or use our online calculator to estimate the postage price and delivery time to send your letter (excludes bulk mail services).
Underpaid mail
When using a red street posting box, you must apply the correct postage for your item.
If we detect that your mail was posted with insufficient postage, we may invoice you the difference.
International business letters
We mail business letters and documents to 220+ international destinations across the globe.
Choose from International Courier, International Express, International Post Registered and International Economy Air.
Rigid items should not be sent in envelopes
Small, 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.
Contact your Account Manager, or visit your local Post Office, to discuss the best packaging solution for your items.
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.
Products and services to help send your business letters within Australia
Stamps
Get information on stamps including prices, concession, collectables, Christmas and personalised.
Envelopes and satchels
View our choice of envelopes including prepaid envelopes and postcards, and plain envelopes in a range of sizes.
MyPost Business
With a MyPost Business account you can order envelopes and other packaging online, plus pay for and print postage labels online.
Not a business customer?
See our personal sending options for sending a letter within Australia.
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. All delivery times are based on the number of business days items take to arrive following the day of posting. See delivery times for specific routes.
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.
