web1.es.sits.pro has no MX records.
Question and response
Question
dig web1.es.sits.pro. MX
Answer
The response has no answer records.
Authority
es.sits.pro. 3600 SOA ns1.sits.pro. admin.sits.nl. 2025111801 3600 300 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0