How would you respond if you received an anon email about an ex saying he is a cheater?

I received an anon email last night from someone telling me my ex is a cheater and doesn't appear to be what he seems. It says he acts like he is monogamous but sleeps with multiple women and is unsafe. How would you respond? Forward to ex? Reply to person and find out more?
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I forwarded it and received a msg that someone hacked into his email account and sent out slanderous msgs (including other people he dated). And he said sorry if anyone is bothering you with this etc. please!
How would you respond if you received an anon email about an ex saying he is a cheater?
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