content-colo.net has no MX records.
Question and response
Question
dig content-colo.net. MX
Answer
The response has no answer records.
Authority
content-colo.net. 86400 SOA ns.ext-dc.de. hostmaster.ext-dc.de. 2025040301 43200 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0