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Email Service Protocols..?

SMTP stands for Simple Mail Transfer Protocol. SMTP is used when
Email is delivered from an Email client, such as Outlook Express, to an
Email server or when Email is delivered from one Email server to
another. SMTP uses port 25.
POP3 stands for Post Office Protocol. POP3 allows an Email client to
download an Email from an Email server. The POP3 protocol is simple
and does not offer many features except for download. Its design
assumes that the Email client downloads all available Email from the
server, deletes them from the server and then disconnects. POP3
normally uses port 110.

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