There are a number of options out there, so really you can take your pick. If I had to recommend one, though, I would have to give my (admittedly biased) recommendation for Appygram.
The main reason I recommend it in your case is it allows for separation of concerns between your e-mail address and your app. So, in the code for your app, you essentially embed an API key. Then, in the Appygram web console, you enter information for the recipient(s) that should receive the feedback. This way, (a) your app never has to maintain the recipient e-mail address and, more importantly (b) if you ever need to change this e-mail address, you can do so in the web console without making any changes or updates to your app. The setup process is easy, and only requires you submit to the API via form or JSON.
Again, I must disclaim that this is a product I'm affiliated with, but it seems like a great fit for your problem at hand. In general, though, something that takes a similar approach where you can substitute your e-mail address for some representative token is likely a good way to go.
Anyway, hope that helps!