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Use when building email features, emails going to spam, high bounce rates, setting up SPF/DKIM/DMARC authentication, implementing email capture, ensuring…
Email Best Practices
Guidance for building deliverable, compliant, user-friendly emails.
Architecture Overview
[User] → [Email Form] → [Validation] → [Double Opt-In]
↓
[Consent Recorded]
↓
[Suppression Check] ←──────────────[Ready to Send]
↓
[Idempotent Send + Retry] ──────→ [Email API]
↓
[Webhook Events]
↓
┌────────┬────────┬─────────────┐
↓ ↓ ↓ ↓
Delivered Bounced Complained Opened/Clicked
↓ ↓
[Suppression List Updated]
↓
[List Hygiene Jobs]
Quick Reference
Need to...
See
Set up SPF/DKIM/DMARC, fix spam issues
Deliverability
Build password reset, OTP, confirmations
Transactional Emails
Plan which emails your app needs
Transactional Email Catalog
Build newsletter signup, validate emails
Email Capture
Send newsletters, promotions
Marketing Emails
Ensure CAN-SPAM/GDPR/CASL compliance
Compliance
Decide transactional vs marketing
Email Types
Handle retries, idempotency, errors
Sending Reliability
Process delivery events, set up webhooks
Webhooks & Events
Manage bounces, complaints, suppression
List Management
Start Here
New app?
Start with the Catalog to plan which emails your app needs (password reset, verification, etc.), then set up Deliverability (DNS authentication) before sending your first email.
Spam issues?
Check Deliverability first—authentication problems are the most common cause. Gmail/Yahoo reject unauthenticated emails.
Marketing emails?
Follow this path: Email Capture (collect consent) → Compliance (legal requirements) → Marketing Emails (best practices).
Production-ready sending?
Add reliability: Sending Reliability (retry + idempotency) → Webhooks & Events (track delivery) → List Management (handle bounces).don't have the plugin yet? install it then click "run inline in claude" again.