Devon post workers are to vote tomorrow (Friday) on whether to take industrial action over the Christmas period in an ongoing row over flexible working and overtime.
The Mid Devon Star reported that more than 400 members of the Communication Workers Union at Exeter Mail Centre are due to take part in the ballot, which will last for two weeks.
In a statement, the Royal Mail said that ballot was "disappointing." A spokesman said: "We would rather resolve the issue amicably."
Workers staged a wildcat strike at the centre in August over the same issues, disrupting deliveries to nearly 500,000 homes in the area.
Exeter Mail Centre processes around 1.2 million letters and parcels every day.