Try to install the Email app directly from Google Play Store. If this app is shown as incompatible on your device, side-load it by downloading it from here, enabling the Unknown sources
in Settings -> Security, and installing the apk (either by tapping the apk in the download manager, or via ADB from your PC: adb install -r <path-to-apk>
).
Keep in mind though that this version sometimes breaks the Exchange functionality on some mostly non-Nexus devices. In order to resolve this, you need to also install a copy of latest Exchange2Google.apk app that is available for download from here or here. You don't have to install it as a system app, just side-load it in the same manner as described above.