ns.tdns2.net has no MX records.
Question and response
Question
dig ns.tdns2.net. MX
Answer
The response has no answer records.
Authority
tdns2.net. 86400 SOA ns.tns1.eu. cpanel.cpserver.net. 2022030950 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0