...HS POP3 is a software library
in C (supplied with full source code) implements...according to RFC 1939. Among other features, the library
supports user authentication, reception of basic internet headers...POP3 over TLS / SSL using two methods: POP3S
(used by Gmail) and RFC 2595
HS POP3...and login user name and password.
HS POP3 library
then resolves the server name, connects to it,...repeated until all messages are received.