Send List Emails at the Ideal Time
Where: This change applies to Lightning Experience in Essentials, Professional, Enterprise, Performance, Unlimited, and Developer editions.
Why: To schedule a list email, select Send Later.
Set a date and time for the list email to be sent.
Click Save to save the date and time and return to the list email.
Click Send Later and the email is scheduled to be sent at that date and time.
To change the scheduled time or delete the email, click the Send Later dropdown.
Or, go to the List Emails home page.