What YouTube links activate the preview function?
Then there is a link formatting issue. Here the results of some tests I ran…what “links” trigger the video preview function? 1. Simply including a YouTube URL as standalone text (unlinked): (Gmail actually turns that into a link for you). 2. The YouTube URL as linked text: http://www.youtube.com/watch?v=sdTghdIc5Fo HTML: http://www.youtube.com/watch?v=sdTghdIc5Fo 3. Where the YouTube URL appears in the link only Interestingly, Gmail also displays the video preview where the YouTube address only appears in the URL and not in the text displayed in the email: Click to view video HTML: Click to view video Problems arise when you introduce click tracking, as is typical for any email sent through email marketing software. The destination URL is then no longer a YouTube link but a tracking link. So case 3 looks like this in the HTML: