My bad! Sorry!<p>CL performs a decent, two-way anonymization. When you reply to a listing&#x27;s anonymized e-mail, your own e-mail address is anonymized (just not your name, which I think comes from your From: header or SMTP envelope address? In any case, you control that).<p>Furthermore, the originating SMTP paths are mutually concealed by CL. You don&#x27;t see how the mail arrived into CL, just how it came from CL to you; i.e. it&#x27;s completely remailed.<p>Lastly, even the Message-ID is rewritten. The originator&#x27;s message ID could contain clues about the mail domain and such; CL replaces it with their own.<p>Quite probably, they strip away the signatures from bodies as well; those could inadvertently leak identity bits.<p>[Source: I searched my inbox for some CL interactions, several years old, and examined the headers.]