There's been a recent trend to add animated gifs into email, where the gif is a never ending stream. It's often a timer/countdown to the end of a sale or someth

There's been a recent trend to add animated gifs into email, where the gif is a never ending stream. It's often a timer/countdown to the end of a sale or something. This would be so that even if the server remotely fetched the gif, it would never end, and thus either consume the available resources on the server, or they give up.