Yep, and there are a couple others as well including Sign-in With Apple. So far none of the services I tried supported outbound mail / replies. Replying would

Yep, and there are a couple others as well including Sign-in With Apple. So far none of the services I tried supported outbound mail / replies. Replying would reveal your real email address. My service supports outbound mail and will properly rewrite the From address, etc.