//If I have registered for an event and if I am eligible to receive email notifications upon registration (i.e., email address associated with account and no disabling of notification in preferences), I want to receive the automatic confirmation message, so that I can know for sure that I have successfully registered and so that I can easily pull up information about the event in the future from my email.
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NOTE: Final designs and text pending, based on findings and decisions made in T316772. Final technical decisions to be made in T314877. Also, this will be a preference that users can opt out of (see T317221).
**Acceptance Criteria:**
* If a user has an email address associated with their account and if they have enabled the ability to send a confirmation message of event registration via preferences:
** An email should be automatically sent to their email address after they have registered for an event
* Organizers should only be able to see which participants can be emailed by the organizer via the 'email this user' feature (i.e., not any participants who have blocked communication from the organizer).
* When participants receive emails from organizers, they should not see any other participant email addresses in the email.
* When participants respond to emails from organizers, the email should only be sent to the organizer (i.e., not sent to other participants).