I know this post is about Old gmail, but in new Gmail as well, it adds prefix to my classnames and that breaks my style for the component. It would be great if you can point me to right direction for that issue.
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I am facing similar issue where images uploaded from MailChimp's content manager is not appearing in email but if you use imgur/flickr to host images, it works like a charm in Outlook.com.
Did you find any solution to this? I would like to use MailChimp's content manager to upload images if possible.