Thanks again. I wasn't even aware of ARC. I'll start recommending that. However, there's a big gap between what customers "should" do and what they are willing

Thanks again. I wasn't even aware of ARC. I'll start recommending that. However, there's a big gap between what customers "should" do and what they are willing or even capable to do. I'm sure most people and most companies have no idea how email even works these days. Eg, I'm the only one on my team of 10 infra folks that has any clue at all. We are just going to have to agree to disagree on p=none. Regardless of the policy, the receiving MTA and MUA has all the signal it needs. p=none is very far from being a green light. > You don't have to take all the domains to have a sufficiently accurate general statistics. I'm not a statistician, but I would think that without random sampling, you do? There's no description of how they selected which domains to track.