mail1.macysos.com has no NS records.
NS records for this zone are defined at macysos.com.
NS records for this zone are defined at macysos.com.
Question and response
Question
dig mail1.macysos.com. NS
Answer
The response has no answer records.
Authority
macysos.com. 3600 SOA ns1-07.azure-dns.com. hostmaster.fds.com. 2009031837 900 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0