Response schema changed for POST /zones/{zone_id}/email/sending/subdomains/preview (email_sending_subdomain_config_error)

What changed

Response schema changed for POST /zones/{zone_id}/email/sending/subdomains/preview (email_sending_subdomain_config_error) Affected surface: POST /zones/{zone_id}/email/sending/subdomains/preview. Root cause: schema `email_sending_subdomain_config_error`. Detected at Sun, 16 Aug 2026 08:01:13 UTC UTC.

Diff

{
  "added_fields": [
    "conflicting_subdomain"
  ],
  "path": "POST /zones/{zone_id}/email/sending/subdomains/preview",
  "schema_path": "schema email_sending_subdomain_config_error"
}

Likely impact

This is an additive change. Existing integrations are unaffected; this is mostly useful if you want to take advantage of the new surface.

Recommended action

Diff your serializers against the new schema. The diff above shows what moved.