The 32-year-old victim had left the post office when he was approached by two men at around 9.50am last Friday.
During the incident in Ormiston, East Lothian, the man was grabbed by one of the men while the other stole his money. Both men then ran off before being lost to sight.
The first suspect is described as white, five feet ten inches tall with a stocky build. He was wearing a light-blue hooded top with the hood up and a dark-coloured scarf covering the lower half of his face. He spoke with a local accent.
The second suspect is described as white, five feet five inches tall, with a skinny build and wearing a light-grey hooded top with the hood up. He was also wearing a scarf over the lower half of his face.
Anyone with any information is asked to contact police on 0131-311 3131.