mx.gigahost.no has no CNAME records.
Question and response
Question
dig mx.gigahost.no. NS
Answer
The response has no answer records.
Authority
gigahost.no. 1684 SOA margo.ns.cloudflare.com. dns.cloudflare.com. 2398166468 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0