Line 1: Recipient's Name
Write the recipient's full name on the first line of the address.
Line 2: Street Number and Street Name
On the second line, include the street number and street name.
Line 3: City, State, and Postcode
On the third line, include the suburb or locality, followed by the state abbreviation, and the postcode.
Line 4: Country
If you are sending mail internationally, include "Australia" as the last line of the address.
Here's an example of a complete Australian address:
```
Mr. John Smith
42 Wallaby Way
Sydney, NSW 2000
Australia
```