spf.caslcheck.itracmarketer.com has no MX records.
Question and response
Question
dig spf.caslcheck.itracmarketer.com. MX
Answer
The response has no answer records.
Authority
itracmarketer.com. 1800 SOA amy.ns.cloudflare.com. dns.cloudflare.com. 2397373460 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0