More than 115,000 Royal Mail workers have voted to go on strike in a dispute over pay.
Members of the Communication Workers Union backed the action on Tuesday after ballot papers were sent out three weeks ago.
Workers on the railways and at airports are also in pay disputes with employers, with prices for goods in the UK rising at the fastest rate in 40 years.
The union said postal workers "Will not budge" until they receive a "Dignified, proper pay rise".
The union has demanded Royal Mail group enters into negotiations to secure a "Straight, no-strings pay increase for workers".
"While bosses rake in £758m in profit and shareholders take £400m, workers are expected to take a serious real-terms pay cut," he added.
"Postal workers won't accept their living standards being hammered by bosses who are typical of business leaders today - overpaid, underqualified, out of their depth." Royal Mail said it had offered workers a "Deal worth up to 5.5% for CWU grade colleagues, the biggest increase we have offered for many years, which the CWU rejected"
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