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