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.

Related terms

IMAPIMAP (Internet Message Access Protocol) lets email clients read and manage messages stored on a mail server, keeping them in sync across devices.SMTPSMTP (Simple Mail Transfer Protocol) is the protocol mail servers use to send and relay outgoing email.

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