qemail.mktomail.com has no NS records.
NS records for this zone are defined at mktomail.com.
NS records for this zone are defined at mktomail.com.
Question and response
Question
dig qemail.mktomail.com. NS
Answer
The response has no answer records.
Authority
mktomail.com. 900 SOA ns1.marketo.com. ops.localhost. 2026012104 1800 1800 604800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0