Post Office workers in the CWU union have voted by 83 percent for strikes over plans to slash jobs, services and pensions.
They could strike by the middle of next month.
Dave Ward, CWU general secretary, said, “Staff in the Post Office face 2,000 job losses this year, the closure of their pension scheme and a strategy of slash and burn from the board of the company.”
Some 60 of the largest Post Office branches are being “franchised”.
This involves closing the branch, paying existing staff to leave and high street retailers providing an alternative service in their own premises.
The Post Office remains in public ownership, but funding has fallen from £210 million in 2013 to £80 million this year.
Workers in Royal Mail could be moving towards a strike ballot over attacks on pensions.
Terry Pullinger is the CWU deputy general secretary for postal services.
He said, “The CWU in Royal Mail will use every means at our disposal, including strikes, to defend our members’ future pensions and prevent massive cuts to their incomes in retirement.”