mail.trans-ix.hosting has no CNAME records.
Question and response
Question
dig mail.trans-ix.hosting. NS
Answer
The response has no answer records.
Authority
trans-ix.hosting. 268 SOA nsauth2.trans-ix.net. hostmaster.trans-ix.hosting. 2026020101 301 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0