mail.kashra.com has no CNAME records.
Question and response
Question
dig mail.kashra.com. NS
Answer
The response has no answer records.
Authority
kashra.com. 300 SOA ns1095.ui-dns.de. hostmaster.kundenserver.de. 2017020791 28800 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0