Once a collection his featured/pinned, you will be able to share it by email, choosing the date and time.
Before sending or scheduling the email, you can click on Receive an example to get a preview.
If scheduled an email to be sent at a later time, you will still be able to manage the date and ohourur of sending :
From the collection panel, click ··· View more
Click Manage planning
Send now, edit schedule, preview or cancel the email