reroutingdev.mailtastic.com has no CNAME records.
Question and response
Question
dig reroutingdev.mailtastic.com. NS
Answer
The response has no answer records.
Authority
mailtastic.com. 513 SOA ns77.domaincontrol.com. dns.jomax.net. 2025112400 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0