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SMTP
SMTP stands for Simple Mail Transfer Protocol. This is the generally accepted protocol for sending e-mail messages between servers; most e-mail systems that send mail over the Internet use SMTP to send messages from one server to another; the messages can then be retrieved with an e-mail client using either POP or IMAP.
A: Exchanging messages between mail servers on a different networks. ~even with an educated guess you can get that right..
The answer is A. Exchanging messages between mail servers on different networks.
It's a protocol that enables communication between computers and servers.
POP3 cannot be downloaded but used. It is a protocol which is called Post office Protocol. It is used in between two SMTP servers.
NNTP
Two completely different purposes. FTP (file transfer protocol) servers are designed to transfer files between server and client. Web servers only serve webpages using the HTTP protocol to a web browser, or any remote terminal program that are capable of sending HTTP requests.
"HTTP" is the protocol used by web browsers to communicate with web servers.
There is no such thing as a SMT relay. An SMTP relay, on the other hand, stands for Simple Mail Transfer Protocol. The function of a SMTP is to transfer email messages across two servers of Internet Protocol networks.
HTTP
The protocol adaptation layer servers as a translator between two protocols. This technology is used in digital wireless data transmission systems.