I mean there are no line spaces in the feed.xml if the post is written in the markdown editor about which the issue has been made. Thanks Bob.
I moved to the wysiwyg editor and reuploaded a 1200×630 featured image with the responsive option on. But in the feed.xml, feedburner feed display link, and the feedburner email newsletters going to the subscribers from the feed.xml, the featured image is causing horizontal scrolling in both desktop and mobile gmail apps. Maybe I should use images with max 600px width to fix this?
This point was also about the feed.xml only and I am thankful that it will addressed in issue 742. Thanks.