How not to get into SPAM?

Question

SPF

Good day to developers and system administrators.
Recently, emails sent from my server to hotmail.com simply do not reach recipients. Emails don't even go to spam.
I would like to know what needs to be done in order not to end up in SPAM at all and so that letters always reach the recipients?
SPF, DKIM, what else do you need? Do you need PRT too?
At the moment I have the following situation, I have company.com and a personal account for the client at my-personal-area-company.com
And from my personal account I send letters, specify @company.com as the sender, and this is a different server and other IP.
In order for letters on behalf of @company.com to be safely sent from the my-personal-area-company.com server, do I only need to register SPF? Or something else?

Answer 1

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