mx00.sovendus.com has no NS records.
NS records for this zone are defined at sovendus.com.
NS records for this zone are defined at sovendus.com.
Question and response
Question
dig mx00.sovendus.com. NS
Answer
The response has no answer records.
Authority
sovendus.com. 2560 SOA europe1.sovdns.net. hostmaster.adacor.net. 2026022307 10000 1800 604800 2560
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0