You can add videos using 4 of the following options using the MassMailer Email Template Builder.
- Use the 'Video' content item, drag and drop in the editor if you have Youtube/Vimeo videos and edit the video URL.
- Use the Custom HTML Block to insert non-Youtube/Vimeo videos (this is for technical users).
- Insert them as a basic Image thumbnail/screenshot, which links to the video URL.
- Also, many email clients are still not capable of playing an embedded video, so we wouldn't recommend that quite yet. Instead, you can embed a brief animated GIF that looks like a short video clip... and when the user clicks on it, their default browser or player will open up and play the actual video in its native format. Here is a great blog post by Hubspot on various tools that you can leverage to create animated gifs