mail.secure22.com has no CNAME records.
Question and response
Question
dig mail.secure22.com. NS
Answer
The response has no answer records.
Authority
secure22.com. 5644 SOA ns1.secure22.com. info.secure22.com. 2025061301 10000 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0