Not all emails are created equal. Between spam and miscellaneous messages, there are a lot of emails we get notifications for that don't need to be checked right away. On the other hand, there are business emails and notes from family members we may want to reply to immediately. By turning on email notifications for only your VIP Mailbox in the Mail app, you'll receive fewer non-urgent notifications. Or, you can set a separate notification sound for your VIPs to differentiate between the two.