Because it came from an email address, it's likely a scam. IF there is WMG (Warner Music Group) copyrighted material in a REEL, Facebook would monetize that reel and then send the remuneration to the rightsholder. We have that with all of our IP that is distributed on social media through a distributor like Warner, Sony, ETC. They have an alogrithm that scans all public content on the internet for sonic ID or visual ID and then they autoflag it. Often you receive a copyright notification, but comes from the platform directly. You would ONLY receive an email from lawyers like this if you were using copyrighted material outside of social media. You're likely in the clear here!