fs.emailr.com has no NS records.
NS records for this zone are defined at emailr.com.
NS records for this zone are defined at emailr.com.
Question and response
Question
dig fs.emailr.com. NS
Answer
The response has no answer records.
Authority
emailr.com. 10800 SOA ns1.gandi.net. hostmaster.gandi.net. 1772064000 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0