ONLINE
Deliverability Letter

Dark Mode

Dark mode is a display setting where email apps switch light backgrounds to dark ones and flip text colors so emails feel easier to read in low light.

Dark mode changes the colors of your email so it fits a darker screen. Backgrounds go dark, text goes light, and the whole message feels softer on the eyes. Some email clients apply their own dark theme, others just invert your colors. You do not control every detail, but you can design with it in mind.

Dark mode matters because a big share of people read email this way every day. If your layout only looks good on a bright background, it can break in dark mode. Text can blend into the background, logos can disappear, and product images can look off. That hurts trust, engagement, and clicks.

To handle dark mode well, keep key text as live HTML, not baked into images. Use high contrast color pairs and avoid pure white or pure black so colors adapt more smoothly. Test your campaigns in popular clients with dark mode turned on before you send to your full list. Small fixes here can prevent ugly surprises in the inbox.