
Description: smtp4dev is an open-source SMTP server designed for developers to test email sending applications locally. It provides a simple SMTP server without requiring email account credentials or an internet connection.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Mailosaur is an email testing and automation platform for developers. It allows you to easily catch, view, and test emails from your web app by providing an email address to your app. Mailosaur makes it easy to test email sending, monitor email contents, extract data from emails, and automate email workflows for testing.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API