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What are the standards for font usage and mobile optimization?

Font usage standards for email recommend web safe fonts that display consistently across clients. Georgia, Arial, Verdana, Times New Roman, and similar fonts reliably render. Custom fonts require fallbacks since not all clients support them.

Font sizes should be readable, typically 14 to 16 pixels minimum for body text. Mobile optimization requires larger touch targets for links and sufficient spacing between interactive elements.

Mobile first design is best practice given majority mobile email opens. Use responsive techniques that adapt layout to screen size. Test on actual mobile devices, not just desktop previews, to verify readability and usability.