Why is an application such as POP needed for electronic messaging?

Why is an application such as POP needed for electronic messaging?
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Answer :

Workstations interact with the SMTP host, which receives the mail on behalf of every host in the  organization, to retrieve messages by using a client-server protocol such as Post Office Protocol, version  3(POP3). Although POP3 is used to download messages from the server, the SMTP client still needed on  the desktop to forward messages from the workstation user to its SMTP mail server.
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