mail.sissymeet.com has no CNAME records.
Question and response
Question
dig mail.sissymeet.com. NS
Answer
The response has no answer records.
Authority
sissymeet.com. 1483 SOA ns1.sissymeet.com. dnsadmin.sissymeet.com. 2025091626 3600 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0