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Google claims that inline images in authenticated email are shown automatically in Gmail. Yet I do not observe this with transactional mail I get from serious organizations, such as Stack Exchange and MailChimp: the images are hidden by default and the “Display images below” link appears. Authentication-Results says spf=pass, dkim=pass; DKIM key length is 1024. Is the information in Gmail’s help outdated? Or do they have some extra rules?

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OK, I got it. They mean images attached to the message with Content-Disposition: inline. This does not apply to remote images.

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