The Holiday Calendar allows you to pause your email campaigns on specific days such as holidays, vacations, or any other days you want to put things on hold. The Holiday calendar is available in Growth and Enterprise plans.
You can select the days you want to pause your email campaigns from Settings -> Email Account ->Holiday Calendar
You can choose from the list of pre-defined holidays.
You can also create your own custom holiday by clicking on the + Add a custom Holiday icon on the bottom right.
Choose a custom date and confirm
Any emails scheduled to go out on those days will automatically be rescheduled to the subsequent day according to your delivery window.