We’re temporarily disabling the email triggers until we can make them more robust in a near future update. In the meantime, the alternative would be to use our IFTTT channel, which can do pretty much the same thing as our internal trigger emails.
We want to build a much more robust system. As is, there are some weaknesses in our current design that can trigger emails to be sent far too often, or without a way for them to reset after the trigger threshold has been hit.
If you have any suggestions on what you’d like to have implemented with this feature, please let us know at the our IO forum.