Last tested: Jan 23, 2018
Currently there is not a direct way to do this in Looker.
In the meantime, a workaround would be to use System Activity to get the list of all the users and their email addresses.
If we go to
base url +
/explore/system_activity/user we can see there is a view on the left called USER.
We can select the email field and also apply a filter on the Is Disabled = No
That will give us a list of the email addresses for all the current Looker users.
Another approach would be to use the API and the get_all_users() call to retrieve all the users and their email address, then from the result, exclude the ones where
is_disabled is true.
Finally when you have a list of the users to email, it may be easier to create a group of these email addresses via your email provider, and then use that group in the scheduler to send out to this group of users.