We did not have problems receiving emails, and adding internal testers to builds is still broken.

App Uses Non-Exempt Encryption = FALSE in your plist file. This worked for us as well. But since this does something entirely different and it was never required before, it must mean that there's still a bug in the iTunes dashboard. Support is also useless as usual as they're not acknowledging the issue and wants me to send screenshots and some other useless info.