This is a great way to engage your existing customers and leads. However, remember e-Newsletters have a wide variety of elements in them —Copy, logos, color palettes, images, etc.

Each element of an should be approached through consistent brand strategy. A consistent design allows your subscribers and customers to know who you are right off the bat. It also helps them know what to expect, and then navigate, read, and interact with your content.  While the first thing that comes to mind might be visuals, this also applies to your creative copywriting as well.