ipv6.sin01.ds.network has no MX records.
Question and response
Question
dig ipv6.sin01.ds.network. MX
Answer
The response has no answer records.
Authority
ipv6.sin01.ds.network. 300 SOA names1.ds.network. admin.dreamscapenetworks.com. 2026022311 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0