mx2.sitebuilder.name.tools has no CNAME records.
Question and response
Question
dig mx2.sitebuilder.name.tools. NS
Answer
The response has no answer records.
Authority
name.tools. 1412 SOA margaret.ns.cloudflare.com. dns.cloudflare.com. 2395570243 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0