I know I complained recently that no one else was sending us arc signed mail, but that is no longer true.
We're now seeing a smattering of low volume domains sending us arc-signed mail, about 190 of them in total (possibly from fewer servers). Glad to see it. Someone's using a keysize of 4098... that's odd. There's also one slightly larger sender is who quoting the existing header fields when we get the mail back from them, ie the arc-seal is coming back with d="google.com" a="rsa-sha256" s="arc-20160816". That may just be some weird mta. Brandon
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