For that most important is SPF DNS TXT records. You will need to do it with any SMTP provider anyway, unless you also delegate handling DNS to them.

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DKIM and DEMARC would be the next steps after SPF

But SPF is way more important.

Got it all set up and working now, cannot say that I enjoyed it, but learned a few things along the way. I now know for sure, why I avoided running my own SMTP server. 😬