mail192.dplrmail.com has no CNAME records.
Question and response
Question
dig mail192.dplrmail.com. NS
Answer
The response has no answer records.
Authority
dplrmail.com. 600 SOA pdns05.domaincontrol.com. dns.jomax.net. 2024081300 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0