Canada Post is suspending delivery time guarantees to its customers, acknowledging a lack of progress in contract talks with its unionized workforce.
The suspension comes as a fourth week of rotating strikes at the post office gets underway.
Canada Post says more delivery delays are inevitable in the days to come after the Canadian Union of Postal Workers closed two major processing centres in Ontario and British Columbia.
And because of the shutdowns, it says it will suspend its service delivery guarantees until further notice.
CUP-W members walked off the job early today in Toronto and at the Canada Post distribution centre in nearby Scarborough.
Rotating strikes also resumed late Monday at locations in Nova Scotia, including Halifax, but ended this morning at a processing centre near Vancouver.
Canada Post says more than 180 trailers containing parcels and mail were idled in Toronto alone as of today.
CUP-W national president Mike Palecek says contract talks made little progress in recent weeks despite the presence of a special mediator whose mandate expired on the weekend.
Bargaining for contracts for two groups of employees urban carriers and rural and suburban workers has been ongoing for nearly a year.
Last week, Prime Minister Justin Trudeau warned his government could intervene if progress isn't made soon in the talks, but did not say what action might be taken.