We use MUP to deploy our Meteor app, NYBR. MUP creates three docker containers for running the meteor app, nginx reverse proxy and mongo. Like most applications, the need for sending the email came, ideally we should be using Amazon Web Services SES, but getting their approval was pain in the @$$ and was taking time.
If you get the following error when starting with your react native app
Application AwesomeProject has not been registered. This is either due to a require() error during initialization or failure to call AppRegistry.registerComponent.
You probably are following the react native tutorial here. When you past the code from the hello world example here your registered component name is not matching since you first one was AwesomeProject and the new one is HelloWorld. Just change
AppRegistry.registerComponent( 'HelloWorldApp', () => HelloWorldApp );