Automated Factoid Email Subscription Service

This template sets up a fully automated factoid email subscription service using n8n forms, Airtable, Gmail, and AI integrations.
Users can subscribe to receive interesting factoids about their chosen topic on a daily, weekly, or surprise schedule. The workflow handles subscriptions, unsubscriptions, automated content generation (text + image), and delivery.

It’s a great example of combining AI-generated content, email automation, and user self-service flows into one workflow.

Features

• 📝 Subscribe Flow – n8n Form for users to choose their topic, frequency (daily, weekly, surprise), and email.
• 📩 Confirmation Email – Sends a confirmation message after subscribing.
• ❌ Unsubscribe Flow – Easy form-based opt-out with reason tracking (not just by email, but unique ID-based for security).
• ⏰ Scheduled Sending – Runs daily at 9 AM to check for active subscribers across all intervals.
• ⚡ Concurrent Execution – Uses subworkflows to handle multiple subscribers in parallel.
• 🤖 AI Factoid Generation – Uses Groq LLM + Wikipedia for fact creation, ensuring uniqueness.
• 🎨 AI Image Creation – Generates a child-friendly illustration for each factoid, resized for email delivery.
• 📊 Airtable Integration – Stores subscriber details, tracks last sent, and updates statuses.
• 📧 Email Delivery – Sends engaging HTML emails with factoid text, image, and unsubscribe link.
• 🗂️ Logging – Updates Airtable with "last sent" timestamp for reliable scheduling.