nsaut.tie.cl has no MX records.
Question and response
Question
dig nsaut.tie.cl. MX
Answer
The response has no answer records.
Authority
tie.cl. 3600 SOA nsaut.tie.cl. oper.isp.tie.cl. 2020101244 10800 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0