This question was discussed about 2 years ago.
Do we have any feature built-in Mandrill since then to cater to the requirement mentioned in that link of displaying every email sent through Mandrill in browser by adding a "View In Browser" link? If not, then I am leaning towards implementing something similar to what @Muleskinner did (again mentioned in that link as one of the responses). Please let me know what you guys think about it?