There is one minor edge condition here.
If you reply via email and your mail client is so weird / obscure that Discourse can’t properly parse its MIME mail format … it is unlikely, but theoretically possible, that your email address could be leaked into the posted reply due to failed parsing of “this is the body” and “this is the header” of the email.
To be clear this is very unlikely if you use any remotely common mail client, but I mention it for completeness.
