I just encountered this issue, haven't seen it before, and thought it may be a bug.
I had a task assigned to several members of a team, waiting for one of them to claim it (assigned by a rule in the process to give to users in the team that have a certain role, so it was about half the members of that team). I was notified one of those users had quit, so to just remove that user out of the loop, I deleted her from the team, and then reassigned the task back to the entire team.
I was then notified by a coworker that they'd received an email about the reassignment, and they were surprised because they haven't been part of that team for a couple years.
Looking at the email header, it shows that it was sent to what appears to be every user's email address that had ever been part of that team - many of them deleted - many of them no longer employed.
Even I received the notification, and I'm a team admin, not a team member.
I don't think I've seen this before - but I also usually reassign tasks by user, not by team - so maybe it always happens with team reassignments and I just never noticed.
Has anyone else ever enountered this issue? Is this a known bug?
Currently we're on LFForms 10.2.0.834 and upgrading isn't really in the cards right now.