The rise of technology and the economic downturn are making a mark on traditional postal services provided by New Zealand Post.

The state owned company said it now delivered on average 20 per cent less mail per address than it did three years ago.

The company said the decline of traditional mail was made worse by the recession as businesses cut costs by increasing email use.

However there was a positive side - New Zealand Post said its courier and parcel services were growing as people ordered more goods over the internet.