This has been reported in several places as a phishing scam. Here's one report but there are many others: https://www.sangfroidwebdesign.com/hack-prevention/phishing-alert-fake-email-claiming-copyright-infringement/
We got a message ourselves today through a Squarespace contact form. We've also seen it through our old Wordpress site.
My guess is your message says something like this: "This is Meleena and I am a qualified photographer. I was discouraged, putting it lightly, when I saw my images at your website. If you use a copyrighted image without an owner's permission, you must be aware that you could be sued by the copyright holder..."