Subscribers can receive notifications on their Android phone when they receive a boardmail. I'm looking into doing other notifications as well, but I don't want to overwhelm your phone. If you have some suggestions, I'm open to them.
The notifications feature also works on Chrome and Firefox on the desktop; it may work on other browsers, as well, but I haven't tested any others.
You can enable notifications on the Notifications menu option in your user menu (top right).
This feature was working in a more limited fashion previously, but they changed the spec on me, and it stopped working.