_spf.datex.ca has no MX records.
Question and response
Question
dig _spf.datex.ca. MX
Answer
The response has no answer records.
Authority
datex.ca. 900 SOA ns-1845.awsdns-38.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0