Freightways is starting to deliver parcels in New Zealand on behalf of Australia Post.
The company says the use of its international mail centre at Auckland international airport makes the job efficient.
Frieghtways says the relationship with Australia Post will benefit customers on both sides of the Tasman.
Managing director Dean Bracewell says the initial volume is sevceral thousand items per week and there is plenty of room to increase the volume of parcels and other courier products with Australia Post over time.
He says the deal should also help it attract business with postal players in other countries.