Why messages are marked as Spam - Gmail Help: "Spammers can forge a message to make it look like it's sent by a real website or company that you might trust. To help protect you from such messages, Google tries to verify the real sender using email authentication.
The authentication process tries to verify the real sender by looking at a message's authentication data. This data should be included in a message's "signed-by" or "mailed-by" headers (shown beneath the subject line when you look at a message's details)"
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