There are two servers on a single machine, one send
e-mails and other receives. One is Called Simple Mail Transfer Protocol
which handles outgoing messages. The other is Called POP3 where POP stands for
post office protocol which handles incoming messages.When an e-mail is sent, e-mail client interacts with SMTP to handle the sending. The
SMTP server on host side may have conversations with other SMTP servers to
deliver an e-mail.
The video below is really interesting.This video shows how an E-mail works. Check out this to learn more.
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