The team is working on improving the next Android and iOS apps. We recently released a cross platform email checking library that helps us to detect typos in email domain name.
The library is written in C++ with Java and Objective-C bindings for Android and iOS projects. Check the github page: https://github.com/wordpress-mobile/EmailChecker
Future iOS and Android versions will use that to auto-correct email addresses during sign up in order to lower the number of bounced welcome emails.
It’s dual licensed under GPL v2 and MIT licenses, we hope to see it used in other mobile projects soon!