COMPUTER NETWORKING

Detailed explanation-1: -FTP stands for File Transfer Protocol which used for the transfer of computer files between a client and server on a computer network. Hence, it is not an email protocol.

Detailed explanation-2: -The common protocols for email delivery are Post Office Protocol (POP), Internet Message Access Protocol (IMAP), and Simple Mail Transfer Protocol (SMTP).

Detailed explanation-3: -SMTP (Simple Mail Transfer Protocol) is a TCP/IP protocol used in sending and receiving email. SMTP is used most commonly by email clients, including Gmail, Outlook, Apple Mail and Yahoo Mail. SMTP can send and receive email, but email clients typically use a program with SMTP for sending email.

Detailed explanation-4: -SMTP stands for Simple Mail Transfer Protocol, and it is responsible for sending email messages. This protocol is used by email clients and mail servers to exchange emails between computers. A mail client and the SMTP server communicate with each other over a connection established through a particular email port.