Notes Available in following Link:
lastbenchlistener.wordpress.com/2020/10/26/email/

In this video, I have explained about
1. What is an Email?
2. History of E-mail
3. How does E-mail Works?
-- Protocols used in email systems (IMAP, POP, SMTP)
-- Main Components of Email system (Mail server, DNS, Mail box)
-- MUA , MTA and MDA.