_spf2.superoffice.com has no CNAME records.
Question and response
Question
dig _spf2.superoffice.com. NS
Answer
The response has no answer records.
Authority
superoffice.com. 1057 SOA dns1.cscdns.net. hostmaster.cscdns.net. 2018082268 10000 1800 604800 1500
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0