Why won't every email appear the same for every client, and which ones do we build and test for?
It's technically impossible to code an email so that it appears exactly the same across all email clients (ie Gmail, Outlook, etc), devices, and operating systems.
HTML emails don’t render the same for everyone because of several factors, including:
- Email Client Differences – Gmail, Outlook, Apple Mail, and others have different rendering engines, meaning they interpret HTML and CSS differently.
- CSS Support – Some clients strip out or limit support for certain CSS properties (e.g., Outlook ignores background images).
- Dark Mode & User Preferences – Email clients can apply their own themes, changing text and background colours.
- Device & Screen Size – Emails may appear differently on desktop vs. mobile, and responsiveness isn’t always consistent.
- Security & Spam Filters – Some email clients block external images, custom fonts, or scripts for security reasons.
We test and optimise our email templates to perform all the most popular modern web browsers, operating systems, devices and email clients.
These are:
- Gmail (Chrome)
- Outlook (Android 11.0)
- Outlook.com (Chrome)
- Gmail App (iOS 14.2)
- Gmail App (Android 11.0)
- Office 365 (Chrome)
- iPad Pro (10.5 inch) (iOS 13.1)
Email template support for dark mode or Outlook 16 will not be included, except by specific request, and will require additional scope.