ns2.nameself.com has no MX records.
Question and response
Question
dig ns2.nameself.com. MX
Answer
The response has no answer records.
Authority
nameself.com. 300 SOA ns1.nameself.com. support.webnames.ru. 2020031004 600 60 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0