Most emails go out the moment the action happens (registration, order, refund, subscription change). These are driven by scheduled jobs instead:

• User: Birthday - a daily job emails customers whose birthday is today.
• Order: Abandoned Cart - a job scans carts that were left without checkout and emails the customer (an SMS can follow if the abandoned-cart SMS sequence is enabled).
• Subscription: Meals To Choose Reminder - scheduled reminder, also available via the Send Emails button.
• Proposal: Payment Reminder and Proposal: Payment Past Due - jobs that check proposal balances and due dates.
• Admin: Delivery Date Missing Menu - checked against the order cut-off schedule when cloning menus for upcoming open days.
• Scheduled gift-card deliveries.

Because they run on a schedule, disabling one of these takes effect from the next run; it will not recall emails already queued in the current run.