_net2.no-ack.net has no MX records.
Question and response
Question
dig _net2.no-ack.net. MX
Answer
The response has no answer records.
Authority
no-ack.net. 3600 SOA dns-anycast.no-ack.net. mikael.no-ack.se. 2026022611 3600 600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0