ns1.phase8.net has no MX records.
Question and response
Question
dig ns1.phase8.net. MX
Answer
The response has no answer records.
Authority
phase8.net. 3600 SOA ns0.phase8.net. support.phase8.net. 2019060802 28800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0