lo0.core.lon01.ds.network has no MX records.
Question and response
Question
dig lo0.core.lon01.ds.network. MX
Answer
The response has no answer records.
Authority
lon01.ds.network. 3600 SOA names1.ds.network. dns.ds.network. 2026022112 7200 120 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0