GMass is an email marketing tool designed to enhance Gmail's functionality by enabling users to send personalized mass emails, track opens and clicks, and automate follow-ups. It integrates seamlessly with Google Sheets, allowing for easy management of email lists and campaigns. GMass is particularly popular among small businesses, marketers, and sales professionals for its user-friendly interface and powerful features that simplify email outreach and engagement. For more information, visit their website at https://www.gmass.co/.