email-content-guide
Installation
SKILL.md
Email Content Guide
Rules and constraints for writing email content that lands in the inbox. Apply these every time you generate email copy, build a template, or help debug spam placement.
How to Use This Skill
These are CONSTRAINTS, not suggestions. Apply them automatically when writing any email content. Do not wait for the user to ask about deliverability.
Subject Lines
- Under 50 characters (40 is ideal for mobile preview)
- No ALL CAPS words
- No excessive punctuation (!! or ???)
- No misleading Re: or Fwd: prefixes
- Be specific about what's inside the email
- Personalize when data is available (e.g., include first name or company)
- Front-load the important words (mobile truncates after ~35 chars)