
Description: Mailtester.com is a free online tool for testing and checking the spam score of email messages before sending. It analyzes email content such as the subject line, sender details, and body text to detect anything that could trigger spam filters.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Freemium Email Verifier is a free email verification service that allows you to validate up to 250 email addresses per day. It checks if email addresses exist and are deliverable.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API