Australian and NZ the usual name for postal order
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use postal note in a sentence
Wrote five times, but could not get packet back again, though I enclosed postal note for return in case of rejection.In the Mist of the Mountains | Ethel Turner
The safest ways to remit are by registered letter or postal note.
Send money by registered letter, postal note, or money order on Chatham, New York.Sharps and Flats | John Nevil Maskelyne
Money order and postal note requisitions are also handled in this division.The American Postal Service | Louis Melius