A assumed that email sent to G Suites addresses was protected by DMARC. Am I (1) wrong, (2) was this email really sent from someone inside Amazon, or (3) is there some other explanation?
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In this case, it's DMARC for amazon.com that matters, since that's the domain that this email is (claiming to be) from.
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Right. I just assumed that both Amazon and Google would use demarc religiously. Am I wrong? Is there anything I can do on my end to enable it?
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As far as I know, they do, and Gmail should be enforcing it. I'm as clueless as you are about whether this is actually a valid email from Amazon. It could also be an email that's actually from Amazon but via a compromised email account. Could check the DKIM signature yourself.
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Select 'Show original' in the drop-down menu for the email message and you should see information from Google's servers about the results of DKIM verification, etc. in the headers.

