Never answer an email FROM your email address
After receiving a number of random threat emails from my own email address, I started to wonder if I was hacked. I changed my passwords immediately. Then, after emailing my security team, I found out that it’s pretty easy to spoof an email address, even if a hacker doesn’t have your password! I even tried it with an anonymous email service. Voila, test worked. Lesson learned.
Summary: It’s a crazy world we live in. 99% of the email that ends up in your spam folder deserves to be there, even if it’s from your address.