Meet the GATE: a connected mailbox that learns local delivery patterns and alerts you when your mail arrives. It gives you an ETA every day using its predictive system. You get alerts on your phone via text, email, or Twitter. The system consists of a MailBox Unit and a Home Unit. This is a solar powered solution (optional). You can also get an antenna to extend the range of your Mailbox sensor.
The GATE is compatible with Z-Wave home automation networks. It connects to your network via a WiFi module to send notifications to your smartphone. The companion app is available for iOS/Android phones. It works with Nest and IFTTT. You can find out more on Kickstarter.