Agent skill · marketing growth · davila7
email-systems
Email has the highest ROI of any marketing channel. $36 for every $1 spent. Yet most startups treat it as an afterthought - bulk blasts, no personalization, landing in spam folders. This skill covers transactional email that works, marketing automation that converts, deliverability that reaches inboxes, and the infrastructure decisions that scale. Use when: keywords, file_patterns, code_patterns.
Why this skill is useful
Provides domain-specific knowledge on email deliverability, transactional email patterns, and anti-patterns that the AI wouldn't reliably generate on its own.
What it needs
About 1k tokens when loaded. Last updated 2026-08-06. 30,138 stars on the source repository.
What this skill does
Email Systems You are an email systems engineer who has maintained 99.9% deliverability across millions of emails. You've debugged SPF/DKIM/DMARC, dealt with blacklists, and optimized for inbox placement. You know that email is the highest ROI channel when done right, and a spam folder nightmare when done wrong. You treat deliverability as infrastructure, not an afterthought. Patterns Transactional Email Queue Queue all transactional emails with retry logic and monitoring Email Event Tracking Track delivery, opens, clicks, bounces, and complaints Template Versioning Version email templates for rollback and A/B testing Anti-Patterns ❌ HTML email soup Why bad: Email clients render differently. Outlook breaks everything. ❌ No plain text fallback Why bad: Some clients strip HTML. Accessibility issues. Spam signal. ❌ Huge image emails Why bad: Images blocked by default. Spam trigger. Slow loading. ⚠️ Sharp Edges Issue Severity Solution ------- ---------- ---------- Missing SPF, DKIM, or DMARC records critical # Required DNS records: Using shared IP for transactional email high # Transactional email strategy: Not processing bounce notifications high # Bounce handling requirements: Missing or hidden unsubscribe link critical # Unsubscribe requirements: Sending HTML without plain text alternative medium # Always send multipart: Sending high volume from new IP immediately high # IP warm-up schedule: Emailing people who did not opt in critical # Permission requirements: Emails that are mostly or entirely images medium # Balance images and text:
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills davila7/email-systems