What is email
, often abbreviated to e-mail
, is any method of creating, transmitting,
or storing primarily text-based human communications with digital communications systems.
What is email- e-mail is the exchange of computer-stored messages by telecommunication
Historically, a variety of electronic mail system designs evolved that were often incompatible or not interoperable.
E-mail was one of the first uses of the Internet and is still the most popular use
Email based on the Simple Mail Transfer Protocol (SMTP)
, first published as Internet Standard 10 (RFC 821
) in 1982.
E-mail can also be exchanged between online service provider users and in networks other than the Internet, both public and private.
Understanding how email works
Modern e-mail systems
are based on a store-and-forward model
in which e-mail computer server systems, accept,
forward, or store messages on behalf of users, who only connect to the e-mail infrastructure with their personal computer
or other network-enabled device for the duration of message transmission or retrieval to or from their designated server.
See image to understanding how email works.
So it working like peer-to-peer, user sending letter to some address, mail delivery system sending this letter to server that responsible
for mail box, server store this letter and other user (owner of email box) can read.
How does an email server work
Server have connection to internet and some rules and policies.
How does an email server work - mail server having some SMTP server
(software) that listening port 25
(port 25 linked with smtp -used for e-mail routing between mail servers).
There are list of registerd emails on server, if server recieving message to mail box that is registered here it store it in database and mark it as message to mailbox firstname.lastname@example.org.
User (or some Web Tool) with using POP3 or IMAP
connecting to server and asking status of mailbox and as result server giving stored messages