smtp04.ari-co.icg.net has no MX records.
Question and response
Question
dig smtp04.ari-co.icg.net. MX
Answer
The response has no answer records.
Authority
icg.net. 3600 SOA ns7.customer.level3.net. dns.level3.net. 2024103003 7200 600 2592000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0