POP3 (Post Office Protocol 3)
Post Office Protocol 3 (POP3) is an email retrieval
protocol that downloads emails from a server to a user's device. POP3 is an
older protocol that was designed for use on a single computer, and it has some
limitations compared to more modern protocols:
One-way synchronization
POP3 only allows users to download emails from a server
to a client, not vice versa.
No previewing
POP3 doesn't allow users to preview, search, delete, or
organize emails on the server.
No synchronization between devices
Users must manually create or set folders and settings on
each device.
No real-time synchronization
POP3 lacks real-time synchronization between the email
server and the client.
POP3 is configured to listen on port 110 for plain-text
transmission and port 995 for encrypted communication via SSL/TLS.
POP3 is losing popularity as people use multiple devices
to access their email. Internet Message Access Protocol (IMAP) is a better
option for users who access their email from various devices, as it stores
emails on the mail server.
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