Add Forwarding for {{ @PARAMS.mbox }}@{{ @PARAMS.domain }}

Forwards To must be a valid email address.
Local Copy can be set to Keep to Forward the email and also keep a copy in the inbox for {{ @PARAMS.mbox }}@{{ @PARAMS.domain }}. Discard will forward all incoming emails and will not keep copies in the {{ @PARAMS.mbox }}@{{ @PARAMS.domain }} inbox.