Why are inline images not visible in Mail on macOS Sierra? I'm on Sierra 10.12.3 and Mail wont display inline images. I already Googled for an answer and found a lot of stuff, but no solution so far. 

For Yosemite I found this but can't find the option "Automatically detect and maintain account settings" in Sierra. Is it gone?

I already have "Display remote images in html messages" checked.
Did you enable Load remote content in messages in Mail Preferences > Viewing ?



Automatically detect and maintain account settings isn't related to your question.