We always try to keep our emails to a minimum, however, we also respect when our users decide to not receive any emails at all, and this is why every user has the ability to opt out from emails on their own account.
Opting out from emails does not necessarily mean that users will not get notified at all when new questions are available. Users that opt out from receiving emails tend to answer their questions via our mobile app, where they have app notifications enabled instead of receiving email-notifications.
Administrators can see which users have opted out from receiving emails under People > Users. It is also possible to filter their status on: "Issues" or by email address for specific users. The status of those users will be marked with a warning text, indicating "Opted-out from emails". This information is particularly useful when users sometimes forget that they have opted out of emails in the past.
All users can change this setting in their own account at any time by logging in to &frankly under Account > My Settings and toggling “Emails” on, then save: