What is the functionality of ExpressPigeon and how does it operate? ExpressPigeon is a software designed for Email Marketing, enabling users to create emails using Email Editors. The software offers various features such as the ability to design Simple, Responsive, and Compatible emails on desktop and mobile devices, edit content, embed videos, and utilize Drag & Drop functionality. Additionally, users can preview emails before sending them. ExpressPigeon serves as a customer engagement platform, allowing users to send targeted messages to customers and analyze their Return on Investment (ROI) through reports. The software is compatible with API integration and is utilized by businesses ranging from small enterprises to larger corporations.