A set of e-mail components which implement IMAP, SMTP, POP3, Exchange Web Services, SSL/TLS support, parsing and building MIME and S/MIME messages, Outlook .MSG and .PST conversions, mail merge over database, OAuth 2.0, DNS MX lookup, e-mail address validation, parsing winmail.dat, bounced messages...
.NET Library for Akismet integration. Akismet filters out your comment and track-back spam for you, so you can focus on more important things. A full tutorial on how you can use the library you can find here: http://blog.cretze.ro/?p=78.
Bad Behavior .NET is a .NET port of the original Bad Behavior WordPress plugin. It is built as an HTTP module, so you can just drop it into any existing website and enable it with a simple change to your web.config file.