a44-131.akadns.net has no MX records.
Question and response
Question
dig a44-131.akadns.net. MX
Answer
The response has no answer records.
Authority
akadns.net. 180 SOA internal.akadns.net. hostmaster.akamai.com. 1741200000 90000 90000 90000 180
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0