It is targeting small business customers and online sellers with discounts of up to 50 per cent off their medium parcels when they use the Drop & Go service, available at more than 11,000 branches across the UK.
In addition, the Post Office is offering Drop & Go customers 25 per cent off Royal Mail Special Delivery Guaranteed by 1pm, when sending parcels between 1-2kg.
The sale starts 30th June and will last until 27th July. The offer is available to existing Drop & Go customers and new customers who sign up during the offer period.