ns2.as198831.net has no MX records.
Question and response
Question
dig ns2.as198831.net. MX
Answer
The response has no answer records.
Authority
as198831.net. 1800 SOA alexis.ns.cloudflare.com. dns.cloudflare.com. 2395865665 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0