Originally posted by: DaveSimmons
From scratch: Windows Dev Journal has had articles on the client side of the POP3 protocol, and a google search of "RFC POP3" will turn up the the protocol definition. Use the internet transfer control or any winsock library.
Free: check
www.codeproject.com to see if anyone has posted VB6 code
Paid: there are several veondors offering internet components that include mail (IP*Works, Dart, etc.)
Note on doing it yourself: if I recall correctly, attachments are not really separate files, they are MIME base64-encoded text in the main message, just like "binary" posts on usenet.