user.dynamic.ibericaderedes.es has no MX records.
Question and response
Question
dig user.dynamic.ibericaderedes.es. MX
Answer
The response has no answer records.
Authority
user.dynamic.ibericaderedes.es. 3600 SOA ns1.ibericaderedes.es. redes.ibericaderedes.es. 2025102901 604800 86400 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0