The board of An Post has confirmed it will go ahead with the closure of its parcel delivery service SDS with the loss of 270 jobs.
The Communications Workers' Union had called on the board of An Post to reverse its decision to close down the service.
The company rejected union allegations that the decision to shut SDS was based on flawed financial information and projections.
After a board meeting this morning, An Post Chairwoman Margaret McGinley said following a detailed discussion on the issues raised by the union, the board had concluded that the basis for its decision was sound.
In a letter to Ms McGinley, the CWU called on the board to put a freeze on the decision until what it called the real facts surrounding the decision have been fully examined.
An Post says SDS has lost €28 million over five years and cannot be turned around.
It is standing by its closure deadline of 1 February, and has given staff until tomorrow to sign up for redundancy, retirement or redeployment.
Earlier, around 100 SDS staff protested outside the General Post Office in Dublin as the An Post board held its meeting.
Meanwhile, An Post staff are continuing to ballot on a 5.35% pay and productivity offer which they are expected to reject.
The result of a ballot for industrial action over those pay and productivity proposals will be announced tomorrow.