mailob1.concordfax.com has no CNAME records.
Question and response
Question
dig mailob1.concordfax.com. NS
Answer
The response has no answer records.
Authority
concordfax.com. 451 SOA a1.uberns.com. postmaster.concordfax.com. 2602230001 3600 600 691200 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0