When does replying to a craigslist ad anonymize e-mail address?

I replied to an ad on craigslist. I used my Gmail account to send it to the anonymized craigslist e-mail. The receiver must have seen my real email address because he knew my name even though I didn’t include it in the message. I thought when sending an e-mail to an anonymized cragislist e-mail address,the sender’s e-mail gets anonymized too?

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Author: redbeans