_spf.eastlink.ca has no MX records.
Question and response
Question
dig _spf.eastlink.ca. MX
Answer
The response has no answer records.
Authority
eastlink.ca. 900 SOA ns3.eastlink.ca. dnsadmin.eastlink.ca. 1677 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0