_spf.corisvc.info has no MX records.
Question and response
Question
dig _spf.corisvc.info. MX
Answer
The response has no answer records.
Authority
corisvc.info. 600 SOA ns63.domaincontrol.com. dns.jomax.net. 2024073100 28800 7200 604800 600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0