mx3.elserver.com has no NS records.
NS records for this zone are defined at elserver.com.
NS records for this zone are defined at elserver.com.
Question and response
Question
dig mx3.elserver.com. NS
Answer
The response has no answer records.
Authority
elserver.com. 2560 SOA ns1.godns.net. hostmaster.elserver.com. 1771891200 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0