Post Office Protocol - Wikipedia
https://en.wikipedia.org/wiki/Post_Office_Protocol
OverviewPurposeHistoryExtensions and specificationsSession exampleComparison with IMAPRelated requests for comments (RFCs)See alsoThe Post Office Protocol provides access via an Internet Protocol (IP) network for a user client application to a mailbox (maildrop) maintained on a mail server. The protocol supports list, retrieve and delete operations for messages. POP3 clients connect, retrieve all messages, store them on the client computer, and finally delete them from the server. This design of POP and its procedures was driven by the need of users having only temporary Internet connections, such as
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