DNS
Each new account gets a DNS zone generated from a template. Edit the default template at Admin → DNS Templates to change what records new accounts receive (A, AAAA, MX, TXT/SPF, etc.).
Using an external DNS provider
If you manage DNS externally (e.g. Cloudflare) instead of on the node itself, disable local zone creation for new accounts under Admin → Settings → DNS and point your registrar at your external provider instead. The panel will still show the records customers need to create manually.
Multi-server DNS
In a multi-server deployment, a node can be assigned the DNS role — see Node Roles — so zones are served from a dedicated server rather than the same node running customer sites.