My advice would be to study the email programs of companies who value great design. Take note of how they use structure, typography and color.

Uber, AirBnB, Apple, Huckberry and Casper are a few that inspire our visual design aesthetic. You can learn a lot just by subscribing to the newsletters of companies you admire.

There are also some well-maintained galleries that feature beautiful emails from companies around the world. These are great for inspiration:

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Mike Arsenault
Mike Arsenault is the Founder & CEO of Rejoiner. He works with 350+ online retail & eCommerce companies like Hydroflask, Footjoy, GUESS, and Big Chill to help them grow faster using lifecycle email. He also once lived aboard a 36' sailboat in Boston.