GMass is an AI tool designed to break Gmail’s sending limits and enable users to send larger emails using proprietary technology. It allows users to read and merge fields from Google Sheets and automate email sending based on conditions and logic. The tool offers features like automating follow-up emails, scheduling mail merges in the future, managing bounces and unsubscribes, building email lists, and testing emails for deliverability. GMass also integrates with third-party SMTP services to maximize deliverability and offers domain statistics and link checking features. Overall, GMass is a powerful tool for cold email outreach, link building, membership outreach, and various forms of email communication.