We can still see your email. Also I think that email is connected to your actual Apple ID Email. I think what it’s called is an email relay:
" Mail relay is the process of transferring an email from one server to another for delivery. For example, if you work for Company A and send an email to someone at Company B, you connect to your company’s SMTP server which then relays your email to the server owned by Company B"
So anything sent to that email just relays to your actual Apple ID email.