Vercel, a company that hosts websites and applications, uses React Email to streamline email template development for its conferences, Vercel Ship and Next.js Conf. This framework enables developers to create responsive and elegant email templates using React components, leveraging the familiar JSX syntax to ensure compatibility across different email clients. The team previously used email templates with HTML strings that had to be manually updated, leading to inefficiencies and difficulties in onboarding new teammates. With React Email, Vercel was able to simplify its email template development process, allowing developers to reuse common patterns like headers and footers across emails, set ticket types, and customize the resulting email based on the recipient's needs.