This email is from someone outside my organization and it's not related to my job responsibilities.
I was cc'd on an email sent to one or more people, but I don't personally know the other people it was sent to.
Is the email message a reply to something I never sent or requested?
Do I have an uncomfortable gut feeling about the sender's request to open and attachment or click a link?
I hover my mouse over a link that's displayed in the email message, but the link-to address is for a different website. (this is a big red flag)