dns3.webempresa.eu has no MX records.
Question and response
Question
dig dns3.webempresa.eu. MX
Answer
The response has no answer records.
Authority
webempresa.eu. 600 SOA dns1.webempresa.eu. sysadmin.webempresa.eu. 2016057406 10800 3600 604800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0