dns1.computer42.org has no MX records.
Question and response
Question
dig dns1.computer42.org. MX
Answer
The response has no answer records.
Authority
computer42.org. 10800 SOA dns1.computer42.org. hostmaster.computer42.org. 2511171816 10800 3600 2592000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0