hou4030412.sarenet.com has no MX records.
Question and response
Question
dig hou4030412.sarenet.com. MX
Answer
The response has no answer records.
Authority
sarenet.com. 300 SOA ns1.sarenet.es. dnsmaster.sarenet.es. 2026030501 86400 7200 2592000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0