Hi Odette,
You can't insert the actual video into your email campaign, but you can insert a thumbnail that links out to your video, hosted on YouTube, Vimeo, or your website.
Another great trick we've used at BJC Branding is to convert a portion of the video into an animated gif and insert that image in your email. Really catches the eye and drive clicks.
Hope that helps,
Bryan Caplan
www.bjcbranding.com
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