mail1.intuit.com has no CNAME records.
Question and response
Question
dig mail1.intuit.com. NS
Answer
The response has no answer records.
Authority
intuit.com. 300 SOA a1-182.akam.net. nadmin.intuit.com. 2020477821 1800 1800 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0