Can I find an ad on Craigslist if I only have a person's email?

Craigslist ads are searchable by email address only if the poster has not chosen to mask his email address. Craigslist offers several options when posting an ad, including hiding the poster's email, and postings using these anonymous options cannot be found by searching for the poster's email address.

Craigslist's default option is to use a two-way email relay, which does not reveal the poster's email address to anyone replying to the ad. Users must opt in to allow their email addresses to be visible and searchable by either showing their email address as typed or including contact information in the body of the advertisement.