Hey everyone,
I saw you use manual collection of UDIDs and then sending out notifications about the beta test. Have you thought about using a service like Testflight [1] where you can manage the beta testers (and their UDIDs) more easily, collect the UDID automatically and even notify the testers automatically if there is a new build for them? Actually, there are many more great features that I grew to love during my day-to-day work with lots of beta versions of different apps. Like for example the service being free.
(I'm quite new here, hope this discussion wasn't had before)
Regards, Jan
[1] https://testflightapp.com/
PS: No connection to Testflight, just a very happy user with our company.