Royal Mail blocked a strike by Communications Workers Union members on Thursday, winning a High Court injunction preventing action during the crucial pre-Christmas delivery period.
Royal Mail said of the ruling: "Royal Mail confirms that the High Court has today ruled that the contractual dispute resolution procedures under the Agenda for Growth must be followed before industrial action can take place".
As previously reported, the CWU members have voted for industrial action, with a 48-hour walkout scheduled to start on 19 October.
In a statement to the stock market on Thursday, Royal Mail said that the court's decision had confirmed that any strike action prior to completion of agreed dispute resolution procedures would be unlawful.
General Secretary Dave Ward said: "The company are deluded if they believe their court room politics will resolve this dispute. We're going in there with a 90% vote for action and whatever happens today we'll be walking out of here with a 90% vote for action".
Royal Mail, which was privatised in 2013, is trying to modernise after years of underinvestment and has reduced layers of management, upgraded technology and cut its property bill.
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"We are very committed to working closely with the CWU in order to reach agreement as a matter of priority", the firm said.
Royal Mail said talks would likely take until around Christmas time to complete, or possibly longer.
Royal Mail shares, which have fallen 16.3 percent this year, were up 0.3 percent at 386.8 pence at 1521 GMT.
"The Agenda for Growth is a balanced agreement which gives significant protections to Royal Mail employees". We want to use them to do just that.
"CWU members voted by a momentous 89.1% in favour of industrial action in defence of secure pay, pensions and the future of the service".
Update: 17:50: Here's a video from Royal Mail explains that it's business as usual as negotiations continue.