Complete technical guide to CeFinan's intelligent email notification infrastructure
๐ Published on November 20, 2025
An Automated Email System is an intelligent infrastructure that sends personalized, contextual emails to users without manual intervention. It combines scheduled tasks, event triggers, and smart content generation.
Smart Formula: User Events + Scheduled Tasks + AI Analysis + Professional SMTP = Automated Intelligence
Emails sent at optimal moments
AI-generated content based on user preferences
Handles thousands of users automatically
Maintains regular communication with users
Trigger: Daily/Weekly/Monthly schedule
Content: AI-powered stock analysis with news integration
Personalization: User-selected tickers and market indices
// Trigger: Cron job calls /api/alerts/send
// Frequency check: shouldSendAlert(frequency, lastSent)
// Content: Real-time market data + AI analysisTrigger: User inactive for 30+ days
Content: Personalized re-engagement with latest features
Safeguards: Maximum one email per 30 days per user
// Query: Users inactive 30+ days
// Limit: 50 users per batch
// Delay: 1 second between emailsTrigger: Stock tracking periods expire
Content: Summary of expired stocks + remaining credits
Action: Automatic status update in database
// Check: end_date < NOW()
// Update: status = 'offline'
// Email: Expiration summary + CTATrigger: User adds source for first time
Content: Onboarding guide + platform introduction
Timing: Instant delivery upon account setup
// Trigger: First source selection
// Template: Professional welcome design
// Integration: Same SMTP as authenticationAutomated workflow runs daily at 9:00 AM UTC
Third-party services like cron-job.org
Traditional crontab for dedicated servers
External cron service or GitHub Action calls the API endpoint at precisely 9:00 AM UTC daily.
// Cron expression: 0 9 * * *
GET /api/alerts/send
GET /api/scheduled/update-expired-stocks
GET /api/newsletter/send-inactiveThe system queries multiple tables to identify who should receive emails and what content to include.
// Active alerts with frequency check
SELECT * FROM alert_preferences
WHERE is_active = TRUE
AND shouldSendAlert(frequency, last_sent_at)
// Inactive users for re-engagement
SELECT * FROM users WHERE
DATEDIFF(NOW(), emailVerified) >= 30AI-powered content generation creates personalized emails based on user preferences and market data.
// Content generation pipeline
const analysisData = await generateAIAnalysis(tickers)
const newsData = await fetchMarketNews(indices)
const emailHTML = generateEmailTemplate({
user: userData,
analysis: analysisData,
news: newsData
})Professional SMTP service ensures reliable email delivery with proper authentication and formatting.
// NodeMailer configuration
const transporter = nodemailer.createTransporter({
host: process.env.EMAIL_SERVER_HOST,
port: 465,
secure: true,
auth: { /* secure credentials */ }
})Built-in safeguards prevent spam and ensure optimal deliverability rates.
Comprehensive tracking and monitoring for system performance and user engagement.
// Tracking metrics
await connection.execute(
'INSERT INTO alert_history (user_id, email_sent, content_type)',
[userId, true, 'stock_alert']
)
// Performance monitoring
console.log('Processed alerts:', results.totalSent)All credentials stored in secure environment variables
Professional email service with TLS encryption
Optimized database connections prevent overload
Comprehensive error logging and recovery
Track successful email deliveries and failure rates
Monitor API response times and batch processing duration
Analyze email open rates and click-through patterns
Comprehensive error logging with detailed stack traces
The Automated Email System represents the backbone of user engagement for modern SaaS platforms. By combining intelligent scheduling, AI-powered content generation, and enterprise-grade reliability, it creates a seamless communication experience that scales effortlessly with business growth. ๐๐ง