What is SMTP? We all have heard the term IP, short for Internet Protocol. We need an IP to access the internet but the thing that might have slipped through is the SMTP (Simple Mail Transfer Protocol) which takes care of all the emails. SMTP is the most widely used email protocol and a part of the TCP/IP protocol which is used to send and receive emails. So, how does it work? As part of being a protocol in the application layer, the SMTP server is always waiting for a request. When a mail is sent through an email client (Gmail, Yahoo, Outlook), a TCP connection is made which results in...