There are some automated emails that add distribution lists into the email to notify a large number of people. The thing is when this happens every user in that distribution group gets added as a participant on that ticket.
This just started happening recently, so I assume this is some kind of new feature because we just upgraded from JIRA 7.1.7 to 7.3.3 and to JIRA Service Desk 3.4.
Does anyone have ideas for this sort of thing?