mx2.cst.gov.sa has no CNAME records.
Question and response
Question
dig mx2.cst.gov.sa. NS
Answer
The response has no answer records.
Authority
cst.gov.sa. 355 SOA ns1.cst.gov.sa. admin.cst.gov.sa. 2026013105 3600 3600 1209600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0