The outgoing
server uses SMTP ('Simple Mail Transfer Protocol) to send and deliver messages from a client to a server through port 25. POP ('Post Office Protocol'), on the other hand, permits the user to pick up the message and save it to his own inbox: it's the incoming server. POP3, the most recent version of the Post Office Protocol, has been in use since 1996.
What is SMTP server or POP server?
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The two protocols that handle email traffic (send and receive, respectively) over the internet are POP and SMTP.
