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15 Common Email Signature Mistakes to Avoid
November 11, 2025 6 min read
Kade Crawford
Founder & CEO at Siggly
These common mistakes can undermine your professional image. Here's what to avoid and how to fix it.
Design Mistakes
- Too much information — Keep it concise
- Tiny or huge images — Use appropriate sizing
- Poor color choices — Stick to brand colors
- Inconsistent fonts — Use one font family
- Cluttered layout — Embrace white space
Technical Mistakes
- Broken images — Host on reliable server
- Missing alt text — Always include it
- Signature as image — Use HTML
- Huge file sizes — Compress images
- Not mobile-friendly — Test on phones
Content Mistakes
- Outdated information — Keep details current
- Personal quotes — Usually unprofessional
- Too many social links — Pick 2-3 relevant ones
- Wrong contact info — Verify before deploying
- Expired promotions — Remove old banners
Quick fix: Using a signature management tool prevents most of these mistakes automatically.