smtp2.ic4-privaterelay.appleid.com has no NS records.
NS records for this zone are defined at ic4-privaterelay.appleid.com.
NS records for this zone are defined at ic4-privaterelay.appleid.com.
Question and response
Question
dig smtp2.ic4-privaterelay.appleid.com. NS
Answer
The response has no answer records.
Authority
ic4-privaterelay.appleid.com. 300 SOA ns-ext-prod.jackfruit.apple.com. dnscontact.apple.com. 48 7200 5400 3628800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0