
Description: Boomerang Mail is an email productivity plugin and service that allows users to schedule emails to be sent at a later time or date. It also offers features like email reminders, templates, and read receipts.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Deferred Sender is an email delivery tool that allows you to schedule sending of emails and newsletters at a later, more optimal time. It helps improve email deliverability by preventing emails from getting stuck in spam filters or overwhelming recipients' inboxes.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API