EMAIL AUTOMATION — WORKFLOW OS (OPERATIONAL)

Built as a no-fluff execution skill for email marketing automation across B2B and B2C.

Structure: Core workflows and segmentation in SKILL.md. Platform setup in references/. Revenue economics in references/email-economics.md. Templates in assets/.

Modern Best Practices (January 2026)

2026 Email Landscape

Authentication & Deliverability (Critical)

• Google Sender Guidelines: https://support.google.com/a/answer/81126?hl=en
• Yahoo Sender Hub: https://senders.yahooinc.com/best-practices/
• Microsoft Outlook Requirements: https://learn.microsoft.com/en-us/defender-office-365/email-authentication-dmarc-configure
• BIMI Group (Brand Indicators): https://bimigroup.org/
• Google BIMI Setup: https://support.google.com/a/answer/10911320?hl=en
• Mailtrap Deliverability Guide: https://mailtrap.io/blog/email-deliverability/
• ExpertSender 2026 Deliverability: https://expertsender.com/blog/email-deliverability-in-2026-key-observations-trends-challenges-for-marketers/
• ExactVerify Compliance Guide: https://www.exactverify.com/blog/email-deliverability-compliance-guide
• Amplemarket 2026 Guide: https://www.amplemarket.com/blog/email-deliverability-guide-2026

Platforms

• HubSpot Email: https://knowledge.hubspot.com/marketing-email/create-and-send-marketing-emails
• Klaviyo Help: https://help.klaviyo.com/
• Klaviyo Platform Comparison: https://www.klaviyo.com/blog/best-email-marketing-platforms
• Mailchimp Resources: https://mailchimp.com/resources/
• Brevo Platform Guide: https://www.brevo.com/blog/best-email-marketing-services/
• Knak Email Creation: https://knak.com/blog/2026-email-marketing-trends/

Industry Insights

• Litmus Blog: https://www.litmus.com/blog/
• Mailjet 2026 Trends: https://www.mailjet.com/blog/email-best-practices/email-marketing-trends-2026/
• Email Vendor Selection Guide: https://www.emailvendorselection.com/email-deliverability-guide/
• Vertical Response 2026 Strategies: https://verticalresponse.com/blog/email-marketing-in-2026-trends-tactics-and-what-to-do-now/

When to Use This Skill

• Workflow design: Trigger-based sequences, nurture flows, lifecycle emails
• Platform setup: HubSpot, Klaviyo, Mailchimp, Braze configuration
• Segmentation: List management, behavioral segments, RFM models
• Deliverability: Authentication, warm-up, reputation management
• Revenue attribution: RPE calculation, attribution models, email-attributed revenue
• Retention economics: Churn reduction ROI, segment LTV, cohort analysis
• Channel mix: Email vs. paid comparison, budget allocation, investment justification
• AI optimization: Send-time optimization, predictive content, personalization at scale

When NOT to Use This Skill

• Cold email outreach → Sales prospecting, not marketing automation
• Transactional email infrastructure → Developer/DevOps email delivery setup
• Email HTML/CSS coding → Template development, not strategy
• SMS-only campaigns → Different compliance and workflow patterns
• One-off announcements → This skill focuses on automated sequences

Core: Email Workflow Types

Core: Workflow Design Framework

WORKFLOW: [Name]
TRIGGER: [Event that starts flow]
GOAL: [Primary conversion action]
DURATION: [Total time span]

ENTRY → EMAIL 1 → WAIT → BRANCH (engaged/not) → EMAIL 2 → ... → EXIT

Exit when: Goal met | Unsubscribe | Time limit reached

See assets/workflow-blueprint.md for full template.

Core: Standard Workflow Templates

Welcome Sequence (4 emails, 7 days)

Abandoned Cart (3 emails, 72 hours)

Lead Nurture (6 emails, 4 weeks)

Day 0 → Day 3 → Day 7 → Day 12 → Day 17 → Day 24

Deliver value → Educate → Case study → Handle objections → Compare → Soft close

See full templates: assets/welcome-sequence.md, assets/nurture-sequence.md, assets/cart-abandonment.md

Core: Segmentation Framework

Behavioral Segments

RFM Segmentation (E-commerce)

Core: Email Best Practices

Subject Lines

Do: Under 50 chars, personalize, use numbers, A/B test Avoid: ALL CAPS, !!! excessive punctuation, spam words, misleading

Email Copy Structure

1. Hook (first line): Grab attention, reference pain/benefit
2. Body (2-3 short paragraphs): Value, proof, bridge to CTA
3. CTA (clear, single action): Button or linked text
4. P.S. (optional): Reinforce urgency or secondary offer

Timing

Better approach: Use AI send-time optimization (STO) for per-subscriber timing. See section below.

AI-Powered Optimization (2026)

Send Time Optimization (STO)

AI analyzes individual subscriber behavior to deliver emails at optimal times per recipient—replacing fixed send times.

Predictive Content

AI Performance Benchmarks (2026)

Quick Wins (Start Here)

1. Enable STO — Most platforms have this; immediate lift with no setup
2. Dynamic subject lines — Let AI pick from 3-5 variants per recipient
3. Product recommendations — Enable behavioral recs in cart/browse abandonment

❌ Don’t over-automate: Complex 25-email flows without monitoring damage deliverability. Review automation performance monthly.

Core: Deliverability Checklist

2025-2026 Compliance (Critical)

Google, Yahoo, Microsoft now enforce identical requirements for bulk senders (5000+/day):

• SPF + DKIM + DMARC all configured and aligned
• One-click unsubscribe (RFC 8058) header required
• Spam rate below 0.3% (target <0.1%)
• Custom sending domain (not @gmail.com)
• Valid PTR records for sending IPs
• BIMI configured (recommended for brand trust)

BIMI (Brand Indicators for Message Identification)

BIMI displays your logo next to emails in Gmail, Yahoo, and Apple Mail—increasing brand recognition by up to 44%.

2026 Update: Google now accepts CMC (Common Mark Certificates) without trademark registration—lowering the barrier for smaller brands.

Enforcement Status (January 2026)

❌ No grace period: All three providers now reject unauthenticated bulk email outright.

List Hygiene

• Double opt-in or clear consent
• Hard bounces removed immediately
• Inactive suppressed (90 days no engagement)
• Spam complaints monitored (<0.1%)

Monitoring Targets

Email Revenue Economics (Summary)

Full details: references/email-economics.md

Attribution Models

Revenue Per Email Benchmarks

Key ROI Formula

ROI = (Revenue - Costs) / Costs × 100
Example: ($8,000 - $500) / $500 = 1,500%

Retention & Churn Economics (Summary)

Full details: references/email-economics.md

Email’s Impact on Retention

Churn Reduction Value

Value = Customers Saved × Remaining LTV × Gross Margin

Example: 50 saved × $1,200 LTV × 80% margin = $48,000/month

Channel Mix Economics (Summary)

Full details: references/email-economics.md

Email vs. Other Channels

Email efficiency: 20-30% revenue on 1-3% spend = 10-20x efficiency vs. paid

Email Program ROI

• Annual cost: $64,000 – $150,000
• Annual revenue (100k list): $650,000 – $1,300,000
• Typical ROI: 500-700%

Metrics & KPIs

Metric Reliability (2026)

Primary Metrics

Platform Setup Guides

• references/hubspot-setup.md
• references/klaviyo-setup.md
• references/mailchimp-setup.md

Templates

Decision Tree (Email Triage)

Open rates low (<15%)?
├─ Check sender reputation
├─ A/B test subject lines
└─ Remove inactive subscribers

Click rates low (<1%)?
├─ Check content relevance
├─ Simplify CTA
└─ Test mobile rendering

High unsubscribes (>0.5%)?
├─ Reduce frequency
├─ Improve segmentation
└─ Add preference center

Anti-Patterns

Related Skills

• marketing-leads-generation — Lead capture
• marketing-content-strategy — Content for emails
• marketing-cro — Landing page optimization
• startup-go-to-market — Channel strategy

Usage Notes (Claude)

• Stay operational: return workflow diagrams, email copy templates, setup steps
• For revenue/ROI questions, reference references/email-economics.md
• Always include deliverability requirements (authentication, hygiene)
• Do not invent benchmark data; use ranges or state “varies by industry”