For government checks and etc, yes, I agree. But little johnny's Christmas present is not exactly an essential service.
Canada post might be the agent for government mail servces but it also does alot more.
I agree that is too complicated for me to decide what is essential and what is not essential...but if the government wants to legislate them back to 100% service then they should force the Canada Post corp to comply to mandatory mediators and then eventually mandatory mediator decisions.
Additionally, i am not without empathy for the online businesses that are suffering right now due to the christmas season sales being totally disrupted, but it is hardly something that can be considered an essential service.