Stalwart supports STALWART_RECOVERY_MODE_PORT to configure the port for recovery mode. Unfortunatly, it has no setting for the bind IP, and listen on [::]
It’d be useful to be able to restrict the bind IP for security reason. In my case : I run stalwart as Docker managed by Nomad and using the Consul service mesh to expose services securely. In this configuration, all services must bind on 127.0.0.1 to be secure (else, random allocations which just happens to run on the same node could access the backend directly, bypassing the ACL and the audit log)