Source: https://uptimeify.io/resources/platform-and-support/glossary/pop3

# POP3

> POP3 (Post Office Protocol 3) is an older email protocol that downloads messages from a server to a single device, typically removing them from the server.

POP3 suits single-device, offline workflows but does not sync across devices like IMAP. Monitoring it ensures the mailbox stays reachable for clients that still rely on it.