What is POP3?
POP stands for Post Office Protocol. It is a method of accessing electronic mail that is kept on a dedicated mail server. POP3 permits an email "client" program (MUA) to download remote messages to the client computer. POP was designed for "offline" message access and works best when one uses a single computer, wherein messages are downloaded and then deleted from the mail server. This mode of access is not compatible with access from multiple computers since it tends to sprinkle messages across all of the computers used for mail access. Thus, unless all of those machines share a common file system, the offline mode of access that POP was designed to support effectively ties the user to one computer for message storage and manipulation.
The protocol includes operations for: checking for new messages; permanently removing messages; setting and clearing flags.
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