I was hunting for some POP3 stuff in .NET when I happened across
this thing, basically a fully-featured POP3 / IMAP/ SMTP / WebMail client written in C# with Source code for free! It's really nice and basically provides all the bits I need for my POP3 mail toy I'm working on (basically for handling bounced emails from a bulk mail system). I've yet to poke about in
dasBlog to see how they do POP3. Anyway,
Lumisoft, the company behind this also have a bunch of other projects which are really all pretty nice...