You can configure the notifications for a given project on the project Information page. Those notifications will be sent to the email of the user who configures it.
You can also configure overall notifications on your account (click on your avatar at the top right corner, My Account, Notifications tab).
You can’t configure notifications to be sent to another email, they are configured on a per-user basis.
If you want to use a group email adress, a solution could be to create a GitHub/Gitlab account with the address you would like to receive notification on, to log in on SonarCloud with that account, and to configure the desired notifications using that user.