gslb.lightedge.com has no MX records.
Question and response
Question
dig gslb.lightedge.com. MX
Answer
The response has no answer records.
Authority
gslb.lightedge.com. 30 SOA ns0.lightedge.com. hostmaster.lightedge.com. 2022041940 10800 1800 10800 30
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0