The Communication Workers Union said 88% of its members had voted in favour of strike action.
Talks between the Communication Workers Union (CWU) and Royal Mail have so far proven unsuccessful.
Communication Workers Union (CWU) claim postal workers are "struggling to complete increased delivery rounds".
The Communication Workers Union (CWU) claimed that staff had not had a pay rise for two years.
But the Communication Workers Union has said it was unreasonable to change staff's traditional working pattern on Christmas Eve.
The Communication Workers Union (CWU) said the workforce would have to sort their rounds in Canterbury before delivering the mail in Whitstable.
The Communication Workers Union (CWU) said it had informed Royal Mail of its intention to take industrial action on Monday 10 December.
She made the comments to the Communication Workers Union's annual conference, which she is the first Royal Mail chief executive to address.
BBC: Royal Mail faces a spiral of decline, chief executive says
But the Communication Workers Union (CWU) said the franchising system had cost "thousands" of post office jobs since it began five years ago.
The Communication Workers Union (CWU) says its members are on strike because they are being asked to do more work with fewer people.
The 4, 000 post office workers, members of the Communication Workers Union, are angry that they have not had a pay rise for nearly two years.
Billy Hayes, general secretary of the Communication Workers Union, said the development was "the best possible Christmas present for the majority of our agency members".
The Communication Workers Union (CWU) say cuts in staff and an increasing workload in the run-up to Christmas has left the sorting office in "chaos".
The Communication Workers Union, which has criticised the government on the issue in the past, said the report should be a step towards taking action.
The motion was put forward by the Communication Workers Union which has been holding strikes across the country in a bitter row over jobs, pay and services.
The Communication Workers Union said last week the delays had been caused by changes which have included "slower" trolleys and vans being used instead of postal workers cycling or walking with a pouch.
BBC: Mail delay in south Warwickshire 'resolved within days'
The Communication Workers Union, which has campaigned to raise awareness of dog attacks on postal workers and telecom engineers, welcomed the report as a "strong and clear in its assessment of the failure of current laws".
He was also accused of undermining his party in a private letter to an official of the Communication Workers Union, recommending that the union stopped donating to Labour until the government improved its attitude towards public services.
"We believe that there is a policy to punish union representatives for union activity and that must be changed, " said Steve Bell, of the Communication Workers' Union.
Hundreds of postal workers and members of the Communication Workers' Union attended a rally at Methodist Central Hall in Westminster.
According to the Royal Mail, the current unofficial action has been condemned by the national leadership of the Communication Workers' Union.
The general secretary of the Communication Workers' Union, Derek Hodgson, says he has received private assurances from the chancellor that the government will not countenance a sell-off.
He said only Billy Hayes - general secretary of the Communication Workers' Union, which Mr Johnson himself used to be head of - had come out in support of AV.
The deal GE (nyse: GE - news - people ) reached with the International Union of Electronic Workers-Communication Workers of America (IUE-CWA) and the United Electrical, Radio and Machine Workers of America (UE) covers wages and pensions--but what to do about rapidly rising health costs was always the thorniest issue, as it is an issue with workers, unionized and nonunionized, across the economy.
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