Talks aimed at breaking the bitter dispute between postal union leaders and Royal Mail over pay and working conditions are set to resume later.
The Royal Mail agreement still needs to be voted on by members
The Communication Workers Union (CWU) and Royal Mail agreed to adjourn talks on Thursday evening.
The two sides reached an outline agreement that would include a 6.9% pay rise over two years for postal workers.
But the union wants more detail before deciding whether to recommend the offer to its members before seeking a ballot.
Royal Mail said it had agreed to meet the CWU to clarify outstanding issues, but it added that "the agreement reached and endorsed last Friday by CWU general secretary Billy Hayes and deputy general secretary Dave Ward stands."
It is unclear if resolution is any nearer.
Last week's outline agreement followed lengthy talks between the Royal Mail and the CWU after strike action by postal workers..
If the deal is recommended by the union, a ballot of the CWU's 130,000 Royal Mail members would then be called. In addition to the 6.9% pay offer, the BBC understands that workers would be given a lump sum payment of £175.
The deal would also see consultation on ending the Royal Mail's current final salary pension scheme.
The CWU had previously said that the Royal Mail's modernisation plans would cost 40,000 jobs.