Bits
This is a FWIW.
If we have told the house we are leaving (by hitting the "Not At Home" button on way out door) and the garage door remains open for an additional 10 minutes, the system takes control and lowers the garage door AFTER "the three minute warning" which is a appliance module/wall wart/Sonalert which beeps for three minutes. Additionally; speakers in garage, front porch, patio, basement, all announce "The garage door will close in three minutes"..."two minutes"..."one minute"..."is closing"... Then a Universal Module finally activates the lifter. Cancelling the action is simply telling the house we are really home by hitting the "At Home" button.
I decided to let the system have the autonomy to close the door (the Universal Module is locked out when the door is closed, so there is no chance of an accidental opening) as long as I have plenty of warning that the door is closing and the lifter has safety sensors to prevent door from closing if obstructed by kar, kid, kat, etc.
The email idea is a nice touch, but I didn't want to turn around and drive back home to manually close the door.
Works for us... but we live in a low crime area where I do not worry about the door being open for 13 minutes with us not home.