mail-relay.daisydcs.com has no CNAME records.
Question and response
Question
dig mail-relay.daisydcs.com. NS
Answer
The response has no answer records.
Authority
daisydcs.com. 2955 SOA auth1.dns.gxn.net. hostmaster.daisygroup.com. 2025060514 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0