o1.eml.deskpro.com has no CNAME records.
Question and response
Question
dig o1.eml.deskpro.com. NS
Answer
The response has no answer records.
Authority
deskpro.com. 1800 SOA anna.ns.cloudflare.com. dns.cloudflare.com. 2398605469 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0