The table rates on the Canada Post mod are for lettermail, not for parcel mail. You need to update them manually if there is an increase in rates. The postage for lettermail is then calclulated right in your zen cart, not at Canada Post.
For parcels, you enter your available package sizes, and define your product measurements. Canada Post, not zen cart, will then calculate shipping based on your product size/weight, and your available packaging. You need to plan your packaging properly. Canada Post interface will NOT try and stuff 4 things in a box by turning one of the items sideways to make it fit. Your lengths, widths, and depths definitions have to line up with your package definitions. ie it will NOT put something 2" x 4" x 6" in a box that is 6" x 4" x 2". It WILL stack multiple items within a box. ie it will put two 1x4 x6 items in a 2 x 4 x 6 box.
I find the postage rates quoted to be bang on as long as I've put in a good assortment of package definitions so that multiple items can be accommodated.
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