Vmime is a powerful c++ class library for parsing, generating, or editing internet rfc-[2]822 and mime messages. vmime is designed to provide a fast and an easy way to manipulate internet mail messages.

the recent releases of vmime also include support for using messaging protocols (pop3, imap, smtp and maildir) with a lot of features supported: listing folders, downloading and adding messages to folders, extracting parts from message, getting and setting message flags, and a lot more.