Received an text from unknown email address?

I got a text from someone's gmail account to my iPhone over iMessage, and I have NO idea who it is. They sent me a text saying "Hey". I don't recognize the email and I don't know if I should respond to them. It kind of freaks me out because they have my number and I don't know how they got it.

Ignore it. Don't freak out. I get spam emails all of the time. I ignore them.

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