red has no MX records.
Question and response
Question
dig red. MX
Answer
The response has no answer records.
Authority
red. 3600 SOA a0.nic.red. hostmaster.donuts.email. 1771990836 7200 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0