mail.colordns.net has no MX records.
Question and response
Question
dig mail.colordns.net. MX
Answer
The response has no answer records.
Authority
colordns.net. 86400 SOA ns1.colordns.de. hostmaster.colordns.de. 2024111302 86400 28800 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0