For the first time in weeks, Canada Post began accepting new international mail Monday.
New commercial mail can be dropped off for processing, and scheduled parcel pickup services are also back.
The Crown corporation has been working through a backlog.
It expects a significant portion of processed parcels will be delivered before Christmas.
But there will be delays for domestic packages into the new year.
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Thousands of employees went back to work last week after the labour board ordered an end to the strike.
There is no new agreement yet between Canada Post and the union.