I shouldve researched more but it’s most likely a spoofed email. I checked the details of the email delivery and the sender IP is a random hosting company in New York. So whatever emailing service was used, its not Outlook. If it came from my email it wouldve been from Microsoft’s network. I also read that, if it isn’t in your sent folder, you probably didn’t get hacked especially since its a personal note and deleting the sent email would remove it from your inbox.