mta-q2.nelnet.net has no MX records.
Question and response
Question
dig mta-q2.nelnet.net. MX
Answer
The response has no answer records.
Authority
nelnet.net. 3600 SOA pdns03.domaincontrol.com. dns.jomax.net. 2026022000 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0