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15 Common Email Signature Mistakes to Avoid

November 11, 2025 6 min read
Kade Crawford

Kade Crawford

Founder & CEO at Siggly

Mistakes

These common mistakes can undermine your professional image. Here's what to avoid and how to fix it.

Design Mistakes

  1. Too much information — Keep it concise
  2. Tiny or huge images — Use appropriate sizing
  3. Poor color choices — Stick to brand colors
  4. Inconsistent fonts — Use one font family
  5. Cluttered layout — Embrace white space

Technical Mistakes

  1. Broken images — Host on reliable server
  2. Missing alt text — Always include it
  3. Signature as image — Use HTML
  4. Huge file sizes — Compress images
  5. Not mobile-friendly — Test on phones

Content Mistakes

  1. Outdated information — Keep details current
  2. Personal quotes — Usually unprofessional
  3. Too many social links — Pick 2-3 relevant ones
  4. Wrong contact info — Verify before deploying
  5. Expired promotions — Remove old banners

Quick fix: Using a signature management tool prevents most of these mistakes automatically.

Mistake-free signatures

Siggly's templates help you avoid common pitfalls.