>Then, I encountered a second problem: I had no idea what those were, and seemingly nobody has written about SPF, DKIM, or DMARC in a way that a human can under

>Then, I encountered a second problem: I had no idea what those were, and seemingly nobody has written about SPF, DKIM, or DMARC in a way that a human can understand, not to mention implement. Every article I found was either highly technical, trying to game SEO to sell me something, or too high level to be useful. I guess TFAuthor hasn't done a cursory google search, because if they had they'd have found the ISPmail tutorial[0] which is clear, concise, mostly correct, and approachable if you aren't a total novice to Linux. [0] https://workaround.org/ispmail https://workaround.org/ispmail