dns2.argohost.net has no MX records.
Question and response
Question
dig dns2.argohost.net. MX
Answer
The response has no answer records.
Authority
dns2.argohost.net. 86400 SOA dns1.argohost.net. root.dns2.argohost.net. 2026022000 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0