Domains with DNS TXT v=spf1 include:spf.protection.outlook.com a:relay2.out.onsolution.it a:smtp.onsolution.it a:relay.onsolution.it -all
There is 1 domain that have DNS TXT set to v=spf1 include:spf.protection.outlook.com a:relay2.out.onsolution.it a:smtp.onsolution.it a:relay.onsolution.it -all.