31-year-old Gareth Mills from Shaftesbury admitted December's attack in Ringwood Road in Alderholt.
Five People Bailed Over Armed Raid At Post Office
Five people arrested over an armed robbery in Christchurch have all been bailed.
It happened at 3.32pm on Tuesday 30 July at Hurn post office along Matchams Lane. Two men allegedly threatened staff at the shop with a sword, obtained cash and left the scene in a car.
Nobody was injured in the incident.
Detective Constable Stefanie Belton, of Dorset Police's CID, said:
"I am appealing for witnesses and anyone with information about this incident to contact police as soon as possible.
"I am particularly keen to locate a vehicle, a red Ford Escort with the registration number V82 NEL, in connection with this incident.
"Anyone with information regarding the whereabouts of this car should contact Dorset Police urgently."
Two men from Liverpool, aged 24 and 26, a 22-year-old man and a 27-year-old woman, both from Ferndown, and a 31-year-old woman from Wimborne have been arrested and bailed.
Witnesses and anyone with information should call Dorset Police in confidence on 101, quoting incident number 30:492. Alternatively, call the free and anonymous Crimestoppers line on 0800 555 111 where mobile phone tariffs may apply.
The 18-year-old woman couldn't remember what happened in Damerham High Street - near Fordingbridge.
The two cases happened in the early hours Cambridge Road and Burnaby Road.
Lewis Hine - who has a brain tumour - posted an inspirational film about his life, on his 16th birthday last week.
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