mx2.beamspeed.net has no CNAME records.
Question and response
Question
dig mx2.beamspeed.net. NS
Answer
The response has no answer records.
Authority
beamspeed.net. 3255 SOA ns1.beamspeed.net. hostmaster.beamspeed.net. 2026022501 28800 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0