I recently stumbled across the following site and looked at some of their applications that they have on offer. One of the great tools that they offer is a tool called Postmark. Postmark helps deliver and track transactional emails. The service basically replaces using SMTP, and allows you to send mails and track statistics for emails sent, bounces and spam complaints. Its pretty awesome if you are a blogger like myself and need to track your emails easily and with less cost.
At the moment it is still currently in beta, although you can request and invite to start playing around with at this stage. It has full support for .Net as well as Ruby, Php, and Python among others. There is currently a github directory to download the .Net support library from. Another great feature of Postmark is that it has support for JSON.