The sender is BT-Protection-Signal <mail@mail.burmanches.com
Solved! Go to Solution.
It's 100% a scam, you can report it using What is a phishing scam? Is the email I have received genuine?
That domain you posted was registered last June and is not owned by the BT group, do not open it or click any links, if you choose to report it then delete the email from your inbox after.