HS POP3 Lite
HS POP3 Lite is a software library in C (supplied with full source code) which implements the client side of Post Office Protocol Version 3 (POP3) over TCP socket layer according to RFC 1939. Among other features, the library supports user authentication, reception of basic internet headers and... according to RFC1939 standard. ... To receive email messages from any POP3 RFC1939 compliant server, the user application calls HsPop3GetMail function, specifying mail server name or IP address and login user name and password.
http://www.hillstone-software.com/hs_pop3_demo.exe - 80Kb - Download - Screenshot