+ # Do not use Cloudflare Public DNS as it does not support ECS as required by https://www.spamhaus.org/organization/dnsblusage/
+ # https://www.spamhaus.org/news/article/816/service-update-spamhaus-dnsbl-users-who-query-via-cloudflare-dns-need-to-make-changes-to-email-set-up
+ :nameservers => ["8.8.8.8", "8.8.4.4", "2001:4860:4860::8888", "2001:4860:4860::8844"],