privacy – How did a Craigslist seller know my name when using the anonymous email system?

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 Craigslist e-mail address, the sender’s e-mail gets anonymized too?