When does Gmail display images automatically?

Question

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Is the information in Gmail’s help outdated, or do they have some extra rules?

Answer 1

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