mx.indy500autographs.com has no CNAME records.
Question and response
Question
dig mx.indy500autographs.com. NS
Answer
The response has no answer records.
Authority
indy500autographs.com. 1083 SOA dns.indy500autographs.com. hostmaster.indy500autographs.com. 1560209162 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0