Anatomy of a great email signature

Include

1. 1Full name and job title.
2. 2Company name and one reliable contact method.
3. 3A logo no taller than 60px.
4. 4At most one call-to-action button or banner.

Cut

1. 1Inspirational quotes and “please consider the environment” lines.
2. 2Every social network you have ever registered — pick two or three.
3. 3Background images and web fonts; neither survives Outlook.

Sizes that work

Keep the whole block under 600px wide, images under 200KB, and body text at 13 or 14px. Anything smaller becomes unreadable once Gmail scales it on mobile.