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.
DKIM and DEMARC would be the next steps after SPF
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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. 😬
