Email notifications that are sent to remind you to place your order or notify you of an upcoming choice deadline are turned on or off at the company level, as set by your Office Manager. For this reason, it's not currently possible to opt in or out at a per user level.
If you aren't in the office and don't want to receive these notifications, you can mark yourself as away on your 'My Meals' page which will prevent you from receiving these updates for those orders. If you're worried about missing the choice deadline, we recommend also setting a calendar reminder to order before the choice deadline - we'd hate for you to be left hungry!