Postal workers at a Royal Mail depot in Bristol held a meeting this morning, and will be sent ballot papers to decide if they will go on strike.
Workers at the Mead Street office in Bedminster say they've ended up with a backlog of deliveries.
Royal Mail blamed high levels of sickness for the backlog.
David Wilshire from the Communication Workers Union (CWU) says the Christmas post could be affected:
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Molly has now left the local RSPCA clinic and is recovering well after being shot and abandoned.
Bob has the forecast for Bristol, Gloucestershire, Somerset, Wiltshire and Dorset.
Bob has the forecast for Devon, Cornwall, Somerset and Dorset.