old-auth.axcient.com has no MX records.
Question and response
Question
dig old-auth.axcient.com. MX
Answer
The response has no answer records.
Authority
axcient.com. 300 SOA ns1.efscloud.net. root.efscloud.net. 174 86400 7200 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0