Smartlead

Email Client Compatibility

Prompt

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Test this cold email format across different email clients (Gmail, Outlook, Apple Mail) and provide optimization recommendations for universal compatibility.

Who it’s for?

Technical email designers
cross-platform marketers
email client specialists

Smartlead Use Case

Perfect for ensuring email campaigns render properly across all major email platforms

Example Output:

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EMAIL CLIENT COMPATIBILITY TEST:

GMAIL (Web/Mobile):
✓ Subject line renders properly
✓ HTML formatting supported
✓ Images load correctly
⚠ Line spacing slightly compressed
✓ CTA button displays correctly

OUTLOOK (2016/365):
✓ Text formatting preserved
⚠ Custom fonts fall back to default
✓ Tables render correctly
⚠ Background colors simplified
✓ Links function properly

APPLE MAIL (Desktop/iOS):
✓ Rich text displays properly
✓ Images auto-load (if enabled)
⚠ Some CSS properties ignored
✓ Mobile responsive design works
✓ Dark mode compatibility good

OPTIMIZATION RECOMMENDATIONS:

UNIVERSAL COMPATIBILITY:
• Use web-safe fonts (Arial, Times, etc.)
• Avoid complex CSS properties
• Test background colors across clients
• Ensure plain text version available
• Use tables for consistent layout

MOBILE OPTIMIZATION:
• Single column layout
• Minimum 14px font size
• Touch-friendly button sizes (44px minimum)
• Adequate white space
• Fast-loading images

RENDERING SCORE:
• Gmail: 95/100 (Excellent)
• Outlook: 85/100 (Good)
• Apple Mail: 90/100 (Very Good)
• Overall Compatibility: 90/100

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