Ahahaha, now I feel a bit stupid... GMR does indeed have an email notification service already :D

Found it by logging in on http://multiplayerrobot.com and clicking on my profile picture -> Email notifications

Hi,

First of all: I'm new here, so if someone's already done this, I apologize :)

I'm working on a notification service for GMR games that sends an email when it's your turn.

Anyone else think this is a good feature? I might be in need of alpha testers :)