PR Reminder: From Email Chaos to Slack Magic ⚡

This is a submission for the Postmark Challenge: Inbox Innovators.

What I Built

I created PR Reminder - an intelligent email processing system that automatically transforms GitHub PR notifications into beautifully formatted Slack messages. But here's the twist: it's not just for GitHub! This system can bridge any important emails to modern communication platforms like Slack, Discord, WhatsApp, or even custom webhooks.

The Core Problem: Developers are drowning in email notifications. GitHub sends PR notifications to email, but we live in Slack. Important emails get buried in overflowing inboxes, leading to missed code reviews, delayed responses, and broken team workflows.

The Solution: PR Reminder intelligently:

🔄 Automatically processes inbound emails via Postmark
🧠 Intelligently extracts structured data using AI-powered parsing
🎯 Routes notifications to the right communication channels
📊 Provides analytics and management dashboards
🔧 Supports custom filtering and routing rules

Key Features Showcased:

1. Automatic Email Processing

2. Smart PR Detection

Parses GitHub notification emails (including forwarded ones!)
Extracts: Repository, PR title, status, links, author
Handles multiple email formats and edge cases

3. Beautiful Slack Integration

Rich message formatting with status indicators
Clickable buttons and interactive elements
Team-specific customization

4. Management Dashboard

Demo

🎬 Watch the Full Demo on YouTube

Demo available at [https://www.youtube.com/watch?v=8ftPtwdTquQ]

Code Repository

🔗 Backend: [https://github.com/barth007/supreme-octo-palm-tree.git]
Frontend: [https://github.com/barth007/Pr_reminder.git]

Tech Stack Architecture:

Data Flow:

📧 Email → 🔄 Postmark → 🧠 AI Parser → 💾 Database → 🚀 Slack
    ↓
🎯 Smart Routing → 📊 Analytics → 🔧 User Control

Key Files:

/app/api/v1/endpoints/postmark_webhook.py - Core email processing
/app/services/pr_perser_service.py - AI-powered email parsing
/app/services/slack_notification_service.py - Slack integration
/components/dashboard-screen.tsx - Management interface

How I Built It

🚀 Development Journey

Phase 1: The Email Processing Engine
Postmark's inbound email webhooks became the foundation. The elegance of receiving structured JSON for any email sent to a custom address was game-changing:

@router.post("/inbound")
async def process_postmark_webhook(webhook_data: PostmarkInboundWebhook):
    # Extract recipient to identify user
    recipient_email = extract_recipient_email(webhook_data)
    user = find_user_by_email(db, recipient_email)

    # Parse email content intelligently
    extracted_data = extract_pr_data(webhook_data)

    # Store and auto-send to Slack
    notification = create_pr_notification(db, webhook_data, extracted_data, user)
    trigger_slack_notification(notification)

Phase 2: Intelligent Email Parsing
The challenge was making sense of messy email formats. GitHub sends different structures, Gmail forwards add layers, and users have various forwarding setups. I built a robust parser that:

Detects forwarded vs. direct emails
Extracts repository names from subjects like [owner/repo]
Parses PR status, numbers, and links from email bodies
Handles HTML and plain text formats gracefully

Phase 3: Real-time Slack Integration
Using Slack's Block Kit for rich formatting was crucial. Instead of plain text, users get:

🟢 Status indicators (Open/Merged/Closed)
📂 Repository and author information
🔗 Direct links to PRs
⏰ Time-aware formatting

Phase 4: The Management Dashboard
Built with Next.js and TypeScript, featuring:

Real-time notification tracking
Advanced filtering and search
Export capabilities for analytics
User-friendly setup flows

🛠 Postmark Experience

What Made Postmark Exceptional:

Webhook Reliability: Zero downtime, consistent delivery
Rich Data Format: Structured JSON with headers, HTML/text bodies
Easy Authentication: HTTP Basic Auth kept security simple
Excellent Documentation: Quick integration, clear examples
Flexible Routing: Custom email addresses for user identification

Technical Integration:

# Postmark webhook payload structure was perfect for our needs
class PostmarkInboundWebhook(BaseModel):
    MessageID: str
    From: EmailStr
    Subject: str
    TextBody: Optional[str]
    HtmlBody: Optional[str]
    # ... rich metadata for intelligent processing

🌟 Beyond GitHub: The Bigger Vision

This system isn't limited to PR notifications! Real-world use cases include:

📈 Business Intelligence

Sales notifications → Slack channels
Customer support tickets → Discord
Server alerts → WhatsApp groups

🏢 Enterprise Workflows

Invoice notifications → Teams channels
HR updates → Employee apps
Security alerts → SOC platforms

🤖 IoT & Automation

Smart home alerts → Mobile push
Manufacturing updates → Dashboard widgets
Health monitor data → Family WhatsApp

The architecture supports custom parsing rules, multiple destination platforms, and intelligent routing based on content analysis.

💡 Key Learnings

Email is Universal: Every system can send emails, making this a perfect integration point
Parsing is Hard: Real-world email formats are messier than specs suggest
User Experience Matters: Seamless OAuth flows and zero-configuration setups drive adoption
Reliability is King: Users trust their critical notifications to your system

🚀 What's Next

AI-Powered Smart Routing: Use LLMs to understand email content and route intelligently
Multi-Platform Support: WhatsApp, Discord, Teams, custom webhooks
Template Engine: User-defined formatting rules
Analytics Dashboard: Delivery rates, response times, team insights
Mobile App: Native iOS/Android for on-the-go management

Ready to Transform Your PR Workflow?

Try PR Reminder today, explore the code, and imagine a world where important emails never get lost in the noise again. With Postmark's robust infrastructure and a bit of creative engineering, we're building bridges between the old world of email and the modern world of team collaboration.

Thanks for reading! Questions, feedback, or collaboration ideas? Let's connect! 🚀

PR Reminder showcases the power of Postmark's inbound email processing, demonstrating how reliable email infrastructure can enable innovative communication workflows. From GitHub to Slack, and beyond to any platform imaginable - the possibilities are endless.

Bartholomew Bassey @barth007