mail.blix.com has no MX records.
Question and response
Question
dig mail.blix.com. MX
Answer
The response has no answer records.
Authority
blix.com. 60 SOA ns1.blix.com. blix.com. 2026021001 28800 7200 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0