HI:
When I inquired with Canada Post regarding the 1 month free shipping , they informed me that the 1 month free shipping will apply after a person has shipped for a year using their OBC(Online Business Centre, provided a person has maintained or reached a certain volume.
That is when their on line system works.
For further information call Canada post Business sales Centre at 1 - 800 - 260-7678 M-F. 8:30 a.m to 4:40 p.m. or email them at Power.seller@canadapost.ca