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"Email template designs should include the layout of the email (one-column or two-column), your brand’s logo, images and other rich media, email body copy, and CTA buttons. It’s also important to include the following email copy components: pre-header and subject lines, email body copy, CTA copy, and a footer."
<https://www.adobe.com/hk_zh/products/xd/solutions/email-design.html>