Transactional email, a vital component in business communication, is sent based on user actions and is essential in various contexts like customer service and e-commerce. The article discusses implementing transactional emails in a real-time AngularJS web application using the SendGrid Web API and PubNub, with a focus on enabling seamless email integration through a 30-line PubNub block and 80 lines of HTML and JavaScript. SendGrid provides robust services for sending, tracking, and managing emails, ensuring high deliverability and performance, while PubNub facilitates real-time data streaming, making it suitable for applications like ride-hailing and IoT. The article guides setting up a SendGrid account, configuring PubNub blocks, and coding the application interface and logic using AngularJS, demonstrating how to send individual emails via the SendGrid REST API while considering factors like content encoding and deliverability.