outmail2.esker.com has no CNAME records.
Question and response
Question
dig outmail2.esker.com. NS
Answer
The response has no answer records.
Authority
esker.com. 300 SOA ns1.esker.com. dnsadm.esker.com. 2026030203 900 300 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0