mail.etapanet.net has no MX records.
Question and response
Question
dig mail.etapanet.net. MX
Answer
The response has no answer records.
Authority
etapanet.net. 3600 SOA dns1.etapa.net.ec. root.etapa.net.ec. 2025122201 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0