mailrelay.brandshelter.com has no NS records.
NS records for this zone are defined at brandshelter.com.
NS records for this zone are defined at brandshelter.com.
Question and response
Question
dig mailrelay.brandshelter.com. NS
Answer
The response has no answer records.
Authority
brandshelter.com. 86400 SOA pdns109.ultradns.com. tech.brandshelter.com. 2020062516 86400 86400 86400 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0