_spf.mxroute.com has no CNAME records.
Question and response
Question
dig _spf.mxroute.com. NS
Answer
The response has no answer records.
Authority
mxroute.com. 3120 SOA ns21.cloudns.net. support.cloudns.net. 2026030201 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0