The Ultimate Guide to CSS
A complete breakdown of the CSS support for the most popular mobile, web and desktop email clients on the planet.Try it for free
Open source email client by the Mozilla Foundation, available for Windows, OS X/macOS, and Linux. Thunderbird displays emails using Gecko, the rendering engine used in the browser Firefox, also by Mozilla.
Tested in Thunderbird 52.3.0 on macOS.
Partial. User is prompted to download webfont, but only embedded (base64 encoded) fonts display.
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