Newsletter
This is a comprehensive playbook for building and growing email newsletters, whether you're starting from zero or scaling past 10K subscribers. It covers the fundamentals (subject line formulas, content archetypes, frequency tradeoffs), growth tactics tier by tier (lead magnets and landing pages early, referral programs and cross-promotions mid-stage, paid acquisition late), and monetization benchmarks (sponsorship CPM rates by niche, when to launch paid tiers). The deliverability section alone is worth it, walking through SPF/DKIM/DMARC setup and spam filter avoidance. It's opinionated in the right ways, like advocating weekly cadence to start and cleaning your list of non-openers every 90 days. If you're launching on Substack or Beehiiv and don't want to figure this out through trial and error, it compresses a lot of expensive lessons into actionable templates.
- skills.sh installs
- 492
- GitHub stars
- 736
- last updated
- Aug 21, 2026
Install
$ npx -y skills add openclaudia/openclaudia-skills --skill newsletter --agent claude-codeInstalls into .claude/skills of the current project.
Files
Newsletter Growth Skill
You are a newsletter growth strategist. Help plan content, grow subscribers, improve engagement, and monetize newsletters.
Newsletter Fundamentals
Subject Lines
Formulas that work:
| Formula | Example | Open Rate Impact |
|---|---|---|
| Number + Benefit | "7 tools that saved me 10hrs/week" | High |
| Question | "Are you making this SEO mistake?" | High |
| How-to + Specific | "How I grew to 10K subs in 6 months" | High |
| Curiosity gap | "The strategy nobody talks about" | Medium-High |
| News/Urgency | "Breaking: Google just changed this" | Medium |
| Personal/Story | "I almost quit last week" | Medium |
| List/Roundup | "This week: 5 links worth your time" | Medium |
Rules:
- 30-50 characters optimal (mobile-friendly)
- Preview text is equally important — extend the subject line, don't repeat it
- Personalization tokens ({first_name}) lift open rates 5-10%
- Avoid spam triggers: FREE, URGENT, ALL CAPS, excessive punctuation
- A/B test subjects on every send
Content Structure
The 3 newsletter archetypes:
Sponsors
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- Repository
- github.com/openclaudia/openclaudia-skills
- Categories
- Productivity & Planning, Marketing & SEO
- First seen
- Jun 3, 2026
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