mailer54.bmesend.com has no NS records.
NS records for this zone are defined at bmesend.com.
NS records for this zone are defined at bmesend.com.
Question and response
Question
dig mailer54.bmesend.com. NS
Answer
The response has no answer records.
Authority
bmesend.com. 900 SOA ns-1750.awsdns-26.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0