Change the email address field on the T1 module Info page in ProFile

You can now use an email address to let the CRA send you online mail and email notifications when there is mail in your CRA My Account inbox.

When you register for online mail, any notices or other correspondence eligible for online transmission will no longer be mailed. Instead, an email notification will be sent out, announcing that there's mail to review on the CRA's My Account secure online service.

After the CRA processes the return, a registration email will be sent to the tax preparer’s email address to confirm registration.