envios.nsprimario.com has no MX records.
Question and response
Question
dig envios.nsprimario.com. MX
Answer
The response has no answer records.
Authority
nsprimario.com. 3600 SOA ns1.nsprimario.com. info.webstudio.es. 1771569622 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0