Suggested readings: Email-Safe Fonts, Custom Fonts
If you are using a custom font in your email design and it looks different when you test it, this means that the font is not supported by your ISP or the browser itself.
To avoid such cases, you can add a Fallback Font through Settings > Inone Settings > Custom Fonts.
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Selecting a fallback font and a fallback font family is mandatory when uploading custom fonts.