I just installed the plugin and everything appears to be working properly. I have a small feature request. I don't need open tracking and click tracking for my messages, so I turned those off through the Mandrill dashboard. However, I also had to set these options to 'false' in the plugin code in order to prevent the plugin from overriding the settings. Would you guys consider having the plugin send 'null' values for those or allowing the user to select them from within the plugin UI? That would eliminate the need to tweak the code every time the plugin is updated. Thanks.