Mail is set to begin moving again on Tuesday after a month-long strike by Canada Post employees comes to a close, but Canadians should expect delays into the new year.

The Canada Industrial Relations Board has ordered the postal workers back on the job, with a deal to be hammered out in the coming year.

But the key issues at the centre of the dispute still remain heading into the next phase of negotiations.

More than 55,000 workers went on strike Nov. 15 after negotiations between the Canadian Union of Postal Workers and Canada Post failed to produce a deal.

Calls for government intervention grew, and for four weeks the federal government insisted it would stay out of the dispute.

But on Friday,Labour Minister Steven MacKinnon directed the Canada Industrial Relations Board to order the 55,000 picketing employees back to work within days if it determined a deal wouldn鈥檛 be possible before the end of the year.

In the meantime, the government would appoint an industrial inquiry commission to look into the bargaining issues and come up with recommendations by May 15 on how a new agreement can be reached.

鈥淭he inquiry will have a broad scope, as it will examine the entire structure of Canada Post from both a customer and business model standpoint, considering the challenging business environment now facing Canada Post,鈥� MacKinnon said.

He characterized the move as a 鈥渢imeout鈥� for the two parties, as they had been swapping proposals and criticisms but didn鈥檛 seem to be moving any closer together.

On Sunday, Canada Post said after two days of hearings over the weekend, the board declared an impasse between the two parties.

It said union members have been ordered back to work under their existing contracts, which have been extended until May to allow the bargaining process to resume.

However, Canada Post and the union agreed to implement a five per cent wage increase, retroactive to the day after the collective agreements expired.

Key issues in the dispute include the size of wage increases and a push by Canada Post to expand delivery to the weekend.

The two sides have been at odds over how to staff the expansion.

Canada Post has pitched the expansion as a way to boost revenues and compete with other carriers. The corporation has been losing money for years.

It has said it would staff weekend delivery shifts with a mix of new permanent part-time positions and some full-time, creating flexibility but keeping costs down.

However, the union has characterized this as an attack on full-time work.

As the strike wore on, business groups had been calling on the government to intervene as companies and individuals scrambled to find alternative modes of delivery with the holiday shopping season in full swing.

Though operations technically resume Tuesday, Canada Post warned it will take time to clear the backlog of packages and letters that were paused when the strike began. It said Canada Post will not receive or pick up new product until Thursday, and will start accepting new international mail on Dec. 23.

Canada Post said Canadians should expect delays into January 2025, and added post office hours of operation may vary while service guarantees will be suspended as the company ramps up operations.

The union decried the federal government鈥檚 decision to step in, saying it tramples on workers鈥� rights to bargain and strike.

It said MacKinnon鈥檚 intervention was part of a troubling pattern in which the government lets employers off the hook from bargaining in good faith with workers and their unions.

It鈥檚 not the first time that power to intervene in other recent labour disputes, in those cases directing the board to not only order workers back to work but also to order binding arbitration.

It鈥檚 a move that the labour movement has strongly criticized, and legal challenges are underway from the unions involved in the other disputes.