Youtube or google video. Both use a flash based player. You could upload the video to either one (youtube provides realtime recording of a video via flash, but it isnt too pretty) and then send the link to the user to visit the page.
It might be possible to embed the video into email also, like on webpages. It would still live on youtube, but the user would see it right in the email and be able to click the start button to play it.
With the just the link in the email, you could do a plain-text email, which would pass most virus scanners. An embedded video email would need to be html, and might be flagged on some virus scanners.
Only other option is sending an actual video, which means a large attachment that no customer would appreciate. You could try to create your own self-playing, self-enclosed flash video, but the technical requirements to do that may be beyond all but a pro - not to mention you'd probably be tagged by virus scanners.
-Steven "spam man"
(used to work at classmates.com in the "mass mailing" department...)
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