title: Should you be able to install a digitally signed APK not from the Play Store?
body: <p>I emailed a final build, digitally-signed APK to a client. Should they be able to open it from  their email, or can you only open signed APKs in a shell <a href="https://stackoverflow.com/questions/7772148/android-how-to-install-signed-apk-on-device">like mentioned here</a> (or from the Play store of course)? They've been able to install APKs before now just from my emails, but they've never been digitally signed.</p>