Design and development
How an email is built and how email apps display it: the code, the rendering limits of each app, and what changes in dark mode.
Entries A–Z
Dark mode
How email apps recolor email in dark mode, the light only tag Gmail now honors, what works in Outlook, and what brands send.
How to fix dark mode in email
Six steps with code: test, add the light only tag, protect colored backgrounds, restore colors in Outlook, fix logos, check again.