New Zealand Post is considering cutting mail deliveries to save money.

Chairman of the state-owned enterprise, Jim Bolger, has told New Zealanders to prepare for change.

Saturday-morning mail deliveries are under review but the favoured option is to cut deliveries to every two days.

Also under consideration is a plan for people to pick up their mail.

It is estimated the use of e-mail has meant 30 million fewer letters are being sent in New Zealand each year.

Postal unions have expressed disappointment at the proposed changes.