mx1.itera.ws has no CNAME records.
Question and response
Question
dig mx1.itera.ws. NS
Answer
The response has no answer records.
Authority
itera.ws. 3591 SOA ns1.itera.ws. hostmaster.itrea.ws. 2026022000 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0