spf.trusted-forwarder.org has no CNAME records.
Question and response
Question
dig spf.trusted-forwarder.org. NS
Answer
The response has no answer records.
Authority
trusted-forwarder.org. 4976 SOA ns1.simkin.ca. hostmaster.trusted-forwarder.org. 2017041002 604800 604800 604800 604800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0