The case study email – A case study on how one of your customers uses your product. Make sure to outline what problems it solves for them (tied to the problems outlined in the first email) and what benefits it brings them (tied to the benefits outlined in the second email). Include a testimonial from a customer and a call to action to signup for your free trial/free plan in this email.
Their email marketing strategy and plan was to optimise their email subject lines because this was the first place that their customers would engage with. To do this, they used an AI generating subject line tool called Phrasee. There are plenty of increasingly sophisticated AIs out there which can do this kind of thing. Phrasee worked for Dominos because it capitalises upon being specific to brand voice, and is optimised to drive action. 

You can assess the interests of individual list members by monitoring which pages they land on, and where they go from there. The process is explained by this example from Airbnb. They use click behaviour to ascertain the destination preferences and travel styles of customers and base their follow-up emails on those preference profiles. It's intensely specific, but it gets results!
Embedding images, animation, and vids in an email are tricky, as these elements often mess up during the transfer from one platform to another. A multitude of email clients, operating systems, and connection speeds make this an area in which to proceed with caution. Videos and animation are undeniably eye-catching and engaging, so it may be worth the risk of a dropoff to include them.
Part of the problem is that people are confused about the difference between ‘strategy' and ‘tactics'. It's essential not to get these two confused. They are related – tactics are a vital part of what makes a strategy work – but they’re not the "be all and end all." Too many people neglect a full and comprehensive strategy in favour of a bunch of loosely-connected tactics. So, to recap: