Last week we had an email avalanche when a teacher sent an email by a personal learning desiger rule.
The idea was to send a personalized email to every student.
The rule was simple: send an email at a specific date and time.
The email contained the token ((student_firstname)) and was sent to all users in the course with the role student.
This apparently created 400 emails, one for every student, that were all sent to every student, making 160000 emails. Expected behaviour was: send one email to every student.
We now realize that he should probably have sent the email to 'Triggering user', but it's not evidently clear that including the token is actually a trigger. Or is it? Maybe you can clarify this for us.
It would be nice to have a preview feature for PLD, maybe even a warning when a user tries does something that would trigger so many emails: "You will be sending 160000 emails! Do you really want to do that?"