"We're working to deliver solutions for both of these groups."
The service would cost $12 and initially run for a two-month trial period starting from next week.
While the Shipmate service was targeted at the domestic market, NZ Post said it was also working with New Zealand companies to help them grow their export markets.
Shipmate would start with a maximum of 5000 customers for its trial.
The Warehouse and Warehouse Stationery chief executive Pejman Okhovat says the move is part of The Warehouse Group's mission to become New Zealand's leading online retailer.
"Customers have been asking us for better online delivery options, and along with our two-hour delivery trial earlier this year, we're looking forward to further improving our offering with more developments to be rolled out in the coming months," he said.
Customers could register with NZ Post to be part of the trial.