dia-static.allophone.net has no MX records.
Question and response
Question
dig dia-static.allophone.net. MX
Answer
The response has no answer records.
Authority
dia-static.allophone.net. 3600 SOA ns-932.awsdns-52.net. dns.ops.allofiber.com. 2019020402 1200 300 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0