In the ongoing pay dispute, thousands of postal workers have decided to strike again.
The Communication Workers Union (CWU), which represents more than 110,000 postal workers at the Royal Mail, claimed that more than 95% of the staff who participated in the ballot wanted to go on strike.
A representative for Royal Mail expressed "disappointment" with the outcome of the vote.
The new vote gives the union a six-month mandate for strike action after workers held strikes over Christmas.
The CWU wants more given the rate at which prices are rising, despite Royal Mail's offer of a pay deal that it claims is worth up to 9 percent over 18 months.
The CWU is also against any changes to the required Sunday work schedule and other working conditions.
Speaking on behalf of Royal Mail, a spokesperson said: "We remain committed to sitting down with the CWU, resolving this conflict, and agreeing a pay and change deal for our employees. ".
"We kindly request that the CWU consider our best and last pay offer and join us in transforming Royal Mail and securing its future. That serves Royal Mail's and all of its employees' best interests, they continued.
