What is my recourse if a co-worker wrote a completely false e-mail to my office saying that I am pregnant and planning to abort the child?

Question Details:

I told the story of my affair to a colleague and he had some previous problems with the guy I was talking about. So he wrote an e-mail to my office from a fake account that my ex-boyfriend does not hold good character. He also wrote that I am pregnant because of him and planning to abort the child. I have been publicly embarrassed over this. I want to take legal action against him. What I can do?

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