The book addresses the most recent challenges faced by the postal and delivery sector. This book includes original essays by prominent researchers and practitioners in the field of postal and delivery economics, originally presented at the 28th Conference on Postal and Delivery Economics held online, December 1-5, 2020.  Chapters discuss topics such as the sustainability of the universal service obligations (USO) quality of service, last mile solutions, competition in liberalized markets, data protection, environmental sustainability, and the impact of the COVID-19 pandemic. This book will be a useful tool not only for graduate students and professors interested in postal and regulatory economics, but also for postal administrations, consulting firms, and federal government departments.