At the moment:
+ The plugin is properly installed and configured
+ Options successfully write serialized data
+ Clicking "Send Test" results in "Error: options page not found." when posting to /wp-admin/options.php
+ A forgot password email successfully sends... through BlueHost instead of Mandrill
+ I hate BH but half my damn clients use them (that feels more important to say in bold than it actually is)
+ Ninjaforms emails, likewise, continue to access BlueHost.
+ Initial activation resulted in a bad headers error but a subsequent activation attempt succeeded.
TL;DR, the plugin runs but doesn't actually hook into the WordPress mail functions.