code: public static ResourceRecordSet<SPFData> spf(String name, Collection<String> spfdata) {
      return new SPFBuilder().name(name).addAll(spfdata).build();
    }
docs: creates spf set of {@link denominator.model.rdata.SPFData SPF} records for the specified name.
  
  @param name    ex. {@code denominator.io.}
  @param spfdata spfdata values ex. {@code [v=spf1 a mx -all, v=spf1 ipv6 -all]}