xenix.io has no MX records.
Question and response
Question
dig xenix.io. MX
Answer
The response has no answer records.
Authority
xenix.io. 3600 SOA ns1-us-ewr.xenixlabs.net. hostmaster.xenixlabs.com. 2026030501 7200 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0