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If you expand the inbound graph out to "90 days" or "1 year" there seems to be a pattern of spikes. I'm curious what causes these. I don't think that they are caused by volume of email spiking, because it's graphing the percentage of incoming email that is encrypted.

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These seem to be weekends. Maybe consumer-oriented email services (Outlook, Google, whatever) use TLS more often than those built for businesses? While this doesn’t make much sense, it only takes a couple of providers to switch a large number of consumers to encrypted email transports, whereas each little server operated for each little business has to be switched individually.

It makes sense, as businesses are usually trailing in adoption of best practices.

it seems to spike around the week-end.

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