How do you verify who your e-mailing when they're using encryption?

Question

Just got an e-mail from someone wishing to purchase an item listed on Craigslist. They responded to my yahoo address but when I attempted to verify who they were through profiles, they didn't exist. Turns out, there's an encription option available at yahoo that does this for you if you want. Is there any way to turn it around so that you can see exactly who it is you are conversing with?
THANX!
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Answer 1

they sent you a scam email dont open email that you dont know who it is from this is why your been scam