admin.saas.tuxis.net has no MX records.
Question and response
Question
dig admin.saas.tuxis.net. MX
Answer
The response has no answer records.
Authority
saas.tuxis.net. 86400 SOA nsauth1.tuxis.net. hostmaster.tuxis.net. 2026021901 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0