a01.3banana.com has no MX records.
Question and response
Question
dig a01.3banana.com. MX
Answer
The response has no answer records.
Authority
a01.3banana.com. 300 SOA ns-ext-prod.jackfruit.apple.com. dnscontact.apple.com. 22 7200 5400 3628800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0