While it may be possible for you to embed Flash in an HTML message, it's not a good idea.
For security purposes, most email programs will block Flash from running in messages.
If you have a Flash video or file that you want to get to your subscribers, put it on a page of your website, and direct subscribers to that page via a link in your message.
You may wish to use a screenshot from the Flash file or video as a clickable image in your email message.
See how to include images in your HTML messages.
Can I put Flash in HTML messages?
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