When a client books a meeting, that client will get an email from eetoCal. If the client hits "reply" on the email, then that email will come to "[email protected]". In this way, the host's email is not exposed to the client booking the meeting.
If this feature is enabled, when a client books the meeting and hits "reply" in the email, those emails will come to the meeting host. Please note that the client booking the meeting can see your email.