Post office didn't charge me for a bubble mailer, will this screw me over if the barcode goes off or something in processing? It's just lettermail but will they throw it out or anything? I did pay for the stamp at least.
There is no way for them to tell just by the barcode whether or not you paid. In my experience Canada Post does not really pay attention to those things. I have sent massive letters with definitely not enough postage and they go through every time. Probably one of the benefits of being a Crown corp