mailer.klsvc.net has no CNAME records.
Question and response
Question
dig mailer.klsvc.net. NS
Answer
The response has no answer records.
Authority
klsvc.net. 1845 SOA ns1.wekloud.com. info.wekloud.com. 2024102800 7200 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0