ns1.bytedns.com has no MX records.
Question and response
Question
dig ns1.bytedns.com. MX
Answer
The response has no answer records.
Authority
bytedns.com. 600 SOA vip3.alidns.com. hostmaster.hichina.com. 2025121607 3600 1200 86400 600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0