[kazinator]

My bad! Sorry!

CL performs a decent, two-way anonymization. When you reply to a listing'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).

Furthermore, the originating SMTP paths are mutually concealed by CL. You don't see how the mail arrived into CL, just how it came from CL to you; i.e. it's completely remailed.

Lastly, even the Message-ID is rewritten. The originator's message ID could contain clues about the mail domain and such; CL replaces it with their own.

Quite probably, they strip away the signatures from bodies as well; those could inadvertently leak identity bits.

[Source: I searched my inbox for some CL interactions, several years old, and examined the headers.]