Craigslist uses a two-way email
relay system, which protects the email addresses for both parties. The system ensures that your email address isn't visible to the original poster. ... Instead of an email address, the original poster will see an anonymous address, like "abcde-0123456789@sale.craigslist.org."
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Craigslist offers an anonymous email to advertisers on the site, so they do not have to reveal their real email address. All replies sent to this anonymous email is forwarded to their actual email. ... When you reply directly from Craigslist, your email address will be visible to the recipient.