_spf.influitive.com has no CNAME records.
Question and response
Question
dig _spf.influitive.com. NS
Answer
The response has no answer records.
Authority
influitive.com. 713 SOA ns-1354.awsdns-41.org. awsdns-hostmaster.amazon.com. 20181212 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0