us.gymmastersoftware.com has no MX records.
Question and response
Question
dig us.gymmasteronline.com. MX
Answer
The response has no answer records.
Authority
gymmasteronline.com. 300 SOA ns1.linode.com. info.gymmastersoftware.com. 2021027005 120 300 1209600 300
Additional
. 0 OPT ; payload 1024, xrcode 0, version 0, flags 0