A protocol designed to allow single-user hosts to read mail from a server. There are three versions: POP, POP2, and POP3. Later versions are not compatible with earlier versions. See also e-mail. WWWebfx Home Page
A protocol (a precursor to Internet Mail Access Protocol (IMAP)) that defines how a client should fetch mail from and return mail to a mail server. Defined in RFC 937 (v2) and in RFC 1939 (v3).
A protocol designed to allow single user hosts to read mail from a server. Version 3, the most recent and most widely used, is defined in RFC 1725. See also: Electronic Mail. [Source: RFC1983