ams.speedtest.axcient.com has no MX records.
Question and response
Question
dig ams.speedtest.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