I've just finished my application to sending emails from console and works fine, tests with our domain mailboxes shows the email arrives and passes all of the verifications.
Even the Mail-Tester service gives out a 10/10 https://www.mail-tester.com/web-rhb06 Also, the AppMailDev DKIM verifier gives a PASS to my DKIM signature, regard of SPF and DMARC records which are accordly setted.
Now the problem is getting the same result in common mailboxes as Gmail, Outlook and Yahoo, our first tests shows that our messages don't reach even the spam folder.
I don't know why because we got all of the requirements as SPF, DKIM and DMARC, and the ip nor the domain are listed on any blacklists.