smtpld21.fortimailcloud.com has no NS records.
NS records for this zone are defined at fortimailcloud.com.
NS records for this zone are defined at fortimailcloud.com.
Question and response
Question
dig smtpld21.fortimailcloud.com. NS
Answer
The response has no answer records.
Authority
fortimailcloud.com. 120 SOA ns3.fortinet.com. mis.fortinet.com. 2026014408 10800 15 604800 120
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0