To stay connected and interact with global peers, friends, co-workers, and
corporate employees, use email communication technology to perform business with
customers and communicate with each other globally. Emails are the best and simplest
way of cyber communication. Email is often the first thing we do when entering the
office as well as the last thing we do when going to bed. With Cloud-based services
providing email servers and infrastructure hosted over the Internet, Security assumes a
significantly high level of priority in today’s cyber world. This chapter reviews the
academic literature published on security challenges faced by Email Infrastructure over
Cloud, discusses the limitations of Email protocols, and compares using cloud-based
email infrastructures and on-premises email servers.
Keywords: Email Infrastructure, Email Cloud Service, Exchange Server, SMTP, POP3, IMAP.
