You could also update your password and review each email addresses in your online account. Under "Your Videotron services", select "Manage your Webmail account" in the Webmail category. If you do change it, please note the password requires 6 to 8 lowercase letters or numbers.
Some additionnal checks with your email accounts in our system may also be required. We sent you a private message to retrieve your contact information and call you back. Alternatively, our technical support is available 24/7:http://www.videotron.com/residential/contact-us