On Collage, you can use different emails for your account login and for the notifications you will be receiving from the system.
To change it, click on your name in the top right corner and select Personal Settings. Under the Account Preferences section, click on the Notification Email dropdown menu to select a different email for your notifications.
Note: Your Login Email is the email address you use to log in to Collage and is used by default for notifications. If you don't have another option available, please make sure you have specified your work email under My Info > Personal > Contact Information.