I tried this http://tribulant.com/docs/wordpress-mailing-list-plugin/7689 but it didn't work for YouTube videos.
Video support in newsletters is an issue because of what email clients support.
The best and most universal way of putting videos in newsletters is by putting an image of the video into the newsletter with a link to a post/page on your site with the video on it. Or even a link directly to the YouTube video.
That way you are certain that all your readers can click and then view the video.
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