centrosdigitales.etb.com.co has no MX records.
Question and response
Question
dig centrosdigitales.etb.com.co. MX
Answer
The response has no answer records.
Authority
etb.com.co. 60 SOA ns1-auth.etb.net.co. postmaster.etb.net.co. 806 3600 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0