ns.cgi.com has no MX records.
Question and response
Question
dig ns.cgi.com. MX
Answer
The response has no answer records.
Authority
cgi.com. 600 SOA ns.cgi.com. dnsops\.gto.cgi.com. 790816513 1200 180 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0