ecom.spf.dominos.com has no CNAME records.
Question and response
Question
dig ecom.spf.dominos.com. NS
Answer
The response has no answer records.
Authority
dominos.com. 498 SOA a1-66.akam.net. dns-admin.dominos.com. 2026030505 10800 3600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0