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by anewone 1947 days ago
Gmail can do their own tracking on what emails a user opens. If they find that a user is leaving a lot of mail from a domain unread, they might decide to start shifting that mail into the spam box to provide a better UX.

As a sender, it's impossible to get any specifics from Google as to when it happens. You can get a generalized spam report rate from them but that's about it.