send_only_mail_server__mail_server_fqdn: send-only-mailserver.ccchh.net
send_only_mail_server__mail_server_fqdn_zone: ccchh.net
send_only_mail_server__mail_domains:
  - name: send-only-mail.ccchh.net
    zone: ccchh.net
send_only_mail_server__bind_9_host: authoritative-dns

cert__acme_account_email: j+letsencrypt-ccchh@jsts.xyz