Royal Mail workers have called off strikes planned in the next two weeks following a challenge by the company.
A series of strikes over pay and conditions have taken place in recent weeks involving 115,000 members of the Communication Workers Union and more action had been planned.
Six scheduled walk-outs have been halted following a letter from Royal Mail’s legal team, though strike action will resume from Saturday 12 November.
The letter highlights numerous material concerns with the formal notification of planned rolling strike action.
Talks are due to take place at the offices of the Advisory, Conciliation and Arbitration Service (Acas) on Monday.
Royal Mail says strike action has cost the business £70m during the first half of its financial year, leading to an operating loss of £219m, compared to a £235m profit last year.
CWU general secretary Dave Ward said: “We recognise the deep frustration felt by many members over this decision.
“But the fact remains that the current direction of Royal Mail doesn’t benefit the company, the community or the country.
“We still need to secure a decent future of this industry, and no attempts to attack our union and our members will change our determination in fighting for that.
“The current focus of the coming days will be negotiations that can hopefully achieve a sensible deal to end this dispute.
“In the meantime, I appeal to our members to stand by their union – stay strong and don’t be provoked.”
CWU acting deputy general secretary Andy Furey said: “We entirely understand the anger felt by many over the decision but we believe it is a necessary move to protect our dispute.
“Our members have been facing down serious harassment from the highest levels of Royal Mail as they defend their industry and those communities they serve.
“They will not be forced into submission so easily, and we will be reminding the company of their determination at Acas in the coming days.”
Royal Mail said in a statement: “The Communication Workers Union has announced it has withdrawn planned strike action in the next two weeks (November 2, 3, 4, 8, 9 and 10).
“The CWU has withdrawn strike action following Royal Mail writing to CWU to highlight numerous material concerns with the formal notification of planned rolling strike action.
“Royal Mail and CWU have planned talks at Acas tomorrow, Monday October 31.
“We will continue to do all we can to keep business, companies and the country connected.”