Royal Mail spokeswoman, Morag Turnbull said:
"A member of staff fell due to moss on the pavement and steps at South Parade and consequently broke his shoulder. Following a risk assessment of the area, we have notified Doncaster Council of the danger posed by the poor condition of the pavement.
"We have explained to customers in South Parade that we must suspend deliveries to their address as a precautionary measure. They will be able to collect their mail from Doncaster Delivery Office. We know this is inconvenient and we apologise to customers.