In computer messaging, the Post Office Protocol or POP is an application-layer Internet standard protocol used by email clients to retrieve email from a mail server over a TCP/IP connection. POP version 3 or POP3 is the version in common use today. This protocol does not support two-way syncing and therefore is only ideal if you check your mail on a single mail client.
Secure POP servers listen on port 995, while non-secure non-encrypted communication typically happens on port 110.
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