You may have opened up an American account at some point, without realizing you were on the American side; for that reason, you would be receiving US emails.
Please click on the link provided and contact them in the US to have yourself removed off their mailing list.
Here is the link - on the left side of the page you have Facebook or Twitter links you can click on to speak with someone through their social media pages.
Footnote: Remember to check and make sure you are on the Canadian side of TurboTax, which means you would be here in Canada (.ca) instead of here in USA (.com)
