Samsung Flow - Android and Windows Apps.
Right Inbox - Schedule Emails in Gmail To Be Sent Later
Samsung Accessory Service - Samsung Accessory Service app provides features through which users can connect their accessories to their mobile phones using a variety of different connectivity methods and environments.
Recurrr - Send recurring emails
Samsung Email - Samsung Email app enables users to receive, manage, and send all the important emails from as many email accounts as they want.
FollowUpThen - The simplest way to schedule an email reminder