SNM supports DMARC reporting, but it's disabled by default. For email greybeards, that's fine, but I think it would be useful to teach email newbies (as I was a few months ago) that this is something you should seriously consider enabling. I opted to put this in a new "Advanced Configurations" section that points experienced mailserver admins to our howto guides, and newbies to a couple of important things. refs: https://github.com/NixOS/infra/pull/635
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