My team and I started getting a blank subscription notice that we didn't create and can't find. We are hosting our own JIRA instance and it appears as if someone on another team created a subscription for a user story that we don't have visibility into (or something). So, every morning, we all get an email that contains a subject line "Subscription: User Stories - <some project name>" and nothing else. The email body is completely blank.
I've tried searching our system for things that match that subject line but I can't find anything. How can we find this "subscription" and kill it!? It's becoming very annoying.