About 400 jobs under threat at Royal Mail in Kent
About 400 jobs at the Royal Mail could be axed as four regional sorting offices move to a new flagship centre in Rochester.
The facility is expected to start operating in 2012 and will replace mail centres in Dartford, Canterbury, Tonbridge and Maidstone.
The Royal Mail said it hoped to avoid compulsory redundancies.
The company said it needed to change because of the reduction in the number of people sending letters.
Regional operations director Tom Willis said: "By asking people to demonstrate a reasonable flexibility, we expect that everyone who wants to remain in Royal Mail will be able to do so."
The Royal Mail currently employs about 3,700 workers in Kent.
Dave Banbury, from the Kent branch of the postal workers' union the CWU, has said the plans are bad for morale.