Postal wokers have overwhelmingly rejected company plans to reform delivery and collection services.
But the workers, who are members of the Communications Workers Union (CWU), have said they will not take further industrial action before Christmas after a one-day stoppage last week.
The matter is set to be adjudicated on by the Labour Court in the New Year.
Out of a total of 4,315 collection and delivery staff balloted, only 195 supported draft management proposals, which include job cuts and overtime cutbacks in the company's collection and delivery service.
In a statement, the CWU said it had requested that Mr Tom Pomphrett of the Labour Relations Commission (LRC) reconvene talks at his earliest convenience. The LRC later, as expected, referred the matter to the Labour Court.
National Officer, Postal Sector, of the CWU Mr Seán Mac Donagh said: "Given that no serious gaps were bridged, and in the absence of a major transformation in the behaviour and attitude of senior management, a protracted and drawn out process in the Labour Court now seems inevitable".
The CWU staged a 24-hour stoppage last Wednesday. An Post said deliveries would be back to normal by today following the disruption caused by the stoppage. A backlog of 3.5 million items of mail remained in the system after large volumes were posted on Thursday.
