Alert emails are specific to users and only apply to the wallets they have access to. They can be set by the user themselves or by the master admin, controller or manager users on behalf of standard users.
Shown below are the email alerts that are sent out, they can be turned on or off for each user. These settings are found in the settings menu in the email alerts tab.
Select the regional user, and it will list the wallets they have access to. For each wallet, you can set the alert emails for the selected user.