There are two main type of notification that you can use with Zero app.
1. Less Distracting Notifications - available for every account. notification will be received once every 15 minutes. This option helps you stay focused and does not distract you for every new email you get.
2. Real Time Notification - available only for Gmail and Exchange. Notifications will be received as soon as emails arrive in your email account.
Zero also offers 2 sub options for push notifications for every email account:
1. Smart notifications - Notifications for people and contacts only
2. All notifications - See notification for every email
No Notifications option is also available. Select this option is you do not want to receive any notifications.