Yes.
I must say that I'm not an expert on the international remail industry, but that is my understanding. Mail is collected here in Canada by these businesses, and it's transported to other countries where there are lower postage rates.
There are mailing houses in Canada that collect mail and process it so they can take advantage of volume discounts, but that mail is still delivered and processed through Canada Post. That's not a violation of the exclusive privilege. It's the notion of collecting the mail and transmitting the mail to another country for delivery that violates the exclusive privilege. The exclusive privilege is clearly laid out. I think it's in section 14 of the Canada Post Corporation Act.