Deal with d= not matching @ sender domain
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Divide-By-0 commented
For instance, gappssmtp.com domains like
ordentop-com.20230601.gappssmtp.com
are clearly being sent from ordentop.com. I think we should note the domains for which the @ domain doesn't match the d=domain in the dkim signature.
I suspect qtranslsg.onmicrosoft.com is the same -- so onmicrosoft.com is a similar analog.