ns.rspread.net has no MX records.
Question and response
Question
dig ns.rspread.net. MX
Answer
The response has no answer records.
Authority
rspread.net. 86400 SOA ns1.onlydomains.com. root.onlydomains.com. 2021031601 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0