Hi Daniel
We are now pretty close to launching our app "Yacht Safe" that being said I am just having a few nerves implimenting the cmandrill api thing on a global basis.
our developers are not to good with this for some reason I think it should work.
Our site uses notifications triggered by user interactions.
I have a mailchimp template I want to use and it has a "Text box" which you can add text "I have manually added text in yellow" I am hoping the "main_content " tag will be able to populate this.
I will attach the part of the html in the template that I belive is for the text box Manually added text in Yello, would you be kind enough to have a look and let me know what I should to code this correctly please :0)
Also in the global setting in joomla / server where the mail settings are I an a little confused I will also attach a screen shot of the area I am talking about.

I do have the api setup but also smtp I am not sure what if anything to change.

If you like you can see what we are doing at http://www.yachtsafe.com.au

My Kindest Regards

Malcolm