# Format: Email Newsletter

> Platform: Email
> Version: 1.0.0
> Updated: 2026-03-24
> Category: content

## Specs
- **Subject line:** 30-50 characters (mobile preview)
- **Preview text:** 40-90 characters
- **Body length:** 200-500 words (brief) or 800-1500 (deep dive)
- **Width:** Max 600px for email clients

## Structure

### Subject Line
Specific, curiosity-driven, personal. Avoid spam triggers (ALL CAPS, excessive punctuation).

### Preview Text
Extends the subject line — not a repeat. Provides additional reason to open.

### Body
- Lead with the most valuable insight
- One primary CTA (not three competing ones)
- Scannable: short paragraphs, bold key phrases, links
- Personal tone (write to one person, not an audience)

### Footer
Unsubscribe link (required). Social links. Brief about section.

## Best Practices
1. Subject line determines open rate — test 2-3 variations
2. Send on Tuesday-Thursday, 9-11am local time (test your audience)
3. One CTA per email maximizes click-through rate
4. Plain text sections outperform heavy HTML in many audiences

## Anti-patterns
1. Subject lines that don't match body content (destroys trust)
2. Multiple competing CTAs diluting each other
3. Image-heavy emails (many clients block images by default)

## Quality Checklist
- [ ] Subject line is < 50 chars and specific
- [ ] Preview text complements (not repeats) the subject
- [ ] Single clear CTA
- [ ] Mobile-friendly layout
- [ ] Unsubscribe link present
