How to install corona app on beta testers iOS-devices without USB-connection

Hi there

what is the appropriate “corona-way” to install our iOS-App on the devices of various Beta-Testers instead of publishing it directly to the apple appstore? And instead of installing it per USB-Cable on a users device.

We are looking for something like Testflight, where various beta testers would be informed per email to install the app on their iPhones. 

Kind regards, mobiledevco