mailin2.wbsprt.com has no CNAME records.
Question and response
Question
dig mailin2.wbsprt.com. NS
Answer
The response has no answer records.
Authority
wbsprt.com. 2560 SOA ns1.websupport.sk. admin.websupport.sk. 1772525035 7200 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0