sendmail.pimefactura.com has no MX records.
Question and response
Question
dig sendmail.pimefactura.com. MX
Answer
The response has no answer records.
Authority
pimefactura.com. 60 SOA dns49.servidoresdns.net. hostmaster.servidoresdns.net. 2020030863 21600 3600 2419200 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0