Buffer | Product Update Email Examples

Started the email subject broadly explained the use case
Moving in explained with GIFs to get the initial attention
Then adopted the rule of 3 to explain benefits of the feature and then added a CTA which in this case is a product demo video to explain the feature further in the end for visual engagement

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Whether it's a new feature walkthrough or guiding customers on how to navigate your product, you can do it all by yourself.