I use flash and would like to create a graphic animation in my email
signature. How do i do this ?

In my experience, first you need to use an email program that supports
HTML. Then place your Flash graphic on a web server. Go back to the
email options, where you have typed your signature copy, add a line of
HTML to place the Flash file. There can be a lot of coding to place a
Flash file, but you can get away with just the "embed
src="http://www.mysite.com/fileURL.swf" in brackets. Replace the
actual path of course.