One of the contributing factors in the evolution of digital marketing and business is email. Email allows users to exchange real-time messages and other digital information such as files and images over the internet in a very efficient manner. Each user is required to have a human-readable email address in the format of username@domainname.com. There are various email providers available on the internet, and any user can register to get a free email address.
There are different email application-layer protocols available for sending and receiving mails, and the combination of these protocols helps with end-to-end email exchange between users in the same or different mail domains. The three most commonly used application layer protocols are POP3, IMAP, and SMTP:
- POP3: Post Office Protocol 3 (POP3) is an application layer protocol used by email systems to retrieve...
