Testing Checklist
Before rolling out your new email signature, test it in these clients:
Web + Mobile
Desktop + Web + Mobile
macOS + iOS
Web
Android
How to Test
- Send to yourself: Send a test email to your own account(s) — Gmail, Outlook, Yahoo
- Send to a colleague: Ask them what they see on their device
- Check mobile: Open the test email on your phone (both iOS and Android)
- Check with images off: Disable image loading and see what remains visible
- Check reply/forward: Reply to the email and verify the signature doesn't break in the thread
- Check dark mode: Switch your email client to dark mode and verify readability
Common Issues & Fixes
🖼️ Broken Images
Cause: Images hosted on an expired/blocked URL. Fix: Host images on a reliable CDN or your own website. Avoid embedding base64 images.
📐 Layout Breaking in Outlook
Cause: Outlook uses Word's rendering engine, not a web browser. Fix: Use HTML tables for layout, inline CSS, avoid flexbox/grid.
📱 Too Wide on Mobile
Cause: Fixed-width tables too wide for mobile. Fix: Use max-width instead of width, keep total width under 600px.
🌙 Invisible in Dark Mode
Cause: Dark text on transparent background becomes invisible. Fix: Add background colours, use transparent-safe logo formats (PNG with padding).
↔️ Extra Spacing
Cause: Different email clients add default margins/padding. Fix: Reset margins and padding on table cells. Use cellpadding="0" cellspacing="0".
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