mail.kashra.com has no NS records.
NS records for this zone are defined at kashra.com.
NS records for this zone are defined at kashra.com.
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 1220, xrcode 0, version 0, flags 0