+1 I Agree that embedding a GIF in the email with a nice "play" graphic is a great approach - has worked very well for us! Just make sure to manage your GIF file size. In one instance, I used Photoshop to manually drop unnecessary frames from the image and adjust the frame rate so that it would still look somewhat natural. Here's a simple example where I was given a 46MB GIF that we were able to get down to 710KB.
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