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POP3 stands for Post Office Protocol and is one of the most common protocols used for email retrieval today.
You can customise POP3 as you would any other email: to open, store, write and delete.
While POP3 email is utilised much like other email, it is set up to allow one server to send and receive email and communicate with other servers.
POP3 allows customers to retrieve and store their messages on or offline on their local PC.
You can watch this video also at the source.