mail.virtualxs.com has no NS records.
NS records for this zone are defined at virtualxs.com.
NS records for this zone are defined at virtualxs.com.
Question and response
Question
dig mail.virtualxs.com. NS
Answer
The response has no answer records.
Authority
virtualxs.com. 3600 SOA ns1.virtualxs.com. hostmaster.virtualxs.com. 2023091304 7200 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0