Hi, I think you should, add the HELO / EHLO test at https://www.dnsqueries.com/es/chequear_dominio.php, like https://tools.dnsstuff.com/#mailTest|type=email&&value=manuel.gallart@12i.es also take a watch about, http://www.solvedns.com/reversedns/reversedns.php
Resolve dns
44.197.230.180
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