edgekey.net has no MX records.
Question and response
Question
dig edgekey.net. MX
Answer
The response has no answer records.
Authority
edgekey.net. 180 SOA ns1-2.akamai.com. hostmaster.akamai.com. 1579438379 900 300 604800 180
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0