relay01.mail.daisygroup.com has no MX records.
Question and response
Question
dig relay01.mail.daisygroup.com. MX
Answer
The response has no answer records.
Authority
daisygroup.com. 86400 SOA auth1.dns.gxn.net. hostmaster.daisygroup.com. 2026012909 28800 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0