I created a test user and joined a group. The group owner sees the notification in the dashboard, but did not receive an email notification. I checked the relevant database tables...
The user has himself marked to be notified by email of users joining his groups (table #__social_alerts_map)
The user has a notification record for this event in #__social_notifications
The user does NOT have a record in #__social_mailer.
there is a process in place that sends out emails, and all records within #__social_mail are marked as having an email sent successfully.
It seems to me that the error is that no process is creating an record in #__social_mailer for the join-group event that is written to #__social_notifications. Am I mistaken? Assuming I am correct, is there some setting I should be checking to make sure that notifications in #__social_notifications will write a corresponding record to #__social_mailer ?