Most email programs won’t show embedded videos (or other Flash) in an email. I would suggest embedding the video somewhere on your website or YouTube and providing a link to the video in your PowerMail. One way of doing this is to take a screen shot of the webpage (Alt + Prt Scr), then paste the image in a photo editing program, like this:

Next, crop the image down so all you see is the video player. Like this:

Save the image to your computer as a jpg. Now you can upload this image to your image library in PowerMail, and insert it into your message. In the Image Properties window, under the Link tab, you can make your image link right to the page on your website where the actual video can be found. You can even assign a click-thru tracking name to see how many people click on the image.