spf1.rest.com.au has no CNAME records.
Question and response
Question
dig spf1.rest.com.au. NS
Answer
The response has no answer records.
Authority
rest.com.au. 769 SOA ns-1532.awsdns-63.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0