Individual skill

deliverability-optimization

Email deliverability optimization skill used by the Editor-in-Chief and analyst agents. Provides spam filter avoidance, technical authentication, content filtering rules, and list hygiene management methodologies. Use for 'deliverability,' 'spam filters,' 'email authentication,' 'send optimization,' and similar requests.

en/03-newsletter-engine/.claude/skills/deliverability-optimization/skill.md

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Last checked: Nov 9, 2026

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Repository last updated: Mar 22, 2026
License: Apache-2.0

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# Deliverability Optimization — Email Deliverability Optimization Methodology

Technical deliverability expertise used by the editor-in-chief and analyst agents when designing final edits and send strategies.

## Why Deliverability Matters

No matter how perfect your newsletter is, **if it doesn't reach the inbox**, all effort is wasted. On average, 15–20% of emails land in spam folders or promotional tabs.

## Spam Filter Trigger Avoidance Guide

### Subject Line Spam Trigger Words

| Risk Level | Word/Pattern | Alternative |
|-----------|-------------|-------------|